2057907880681 has 3 divisors (see below), whose sum is σ = 2057909315223. Its totient is φ = 2057906446140.

The previous prime is 2057907880657. The next prime is 2057907880703. The reversal of 2057907880681 is 1860887097502.

The square root of 2057907880681 is 1434541.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 232652840281 + 1825255040400 = 482341^2 + 1351020^2 .

It is not a de Polignac number, because 2057907880681 - 2⁹ = 2057907880169 is a prime.

It is a super-2 number, since 2×2057907880681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2057907880621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 717271 + ... + 2151811.

It is an arithmetic number, because the mean of its divisors is an integer number (685969771741).

Almost surely, 2^{2057907880681} is an apocalyptic number.

2057907880681 is the 1434541-st square number.

2057907880681 is the 717271-st centered octagonal number.

It is an amenable number.

2057907880681 is a deficient number, since it is larger than the sum of its proper divisors (1434542).

2057907880681 is an frugal number, since it uses more digits than its factorization.

2057907880681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2869082 (or 1434541 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 61.

The spelling of 2057907880681 in words is "two trillion, fifty-seven billion, nine hundred seven million, eight hundred eighty thousand, six hundred eighty-one".