1557880918801 has 3 divisors (see below), whose sum is σ = 1557882166953. Its totient is φ = 1557879670650.

The previous prime is 1557880918753. The next prime is 1557880918817. The reversal of 1557880918801 is 1088190887551.

The square root of 1557880918801 is 1248151.

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 is not a de Polignac number, because 1557880918801 - 2¹⁵ = 1557880886033 is a prime.

It is a super-4 number, since 4×1557880918801⁴ (a number of 50 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1557880918801.

It is not an unprimeable number, because it can be changed into a prime (1557880918831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 624076 + ... + 1872226.

It is an arithmetic number, because the mean of its divisors is an integer number (519294055651).

Almost surely, 2^{1557880918801} is an apocalyptic number.

1557880918801 is the 1248151-st square number.

1557880918801 is the 624076-th centered octagonal number.

It is an amenable number.

1557880918801 is a deficient number, since it is larger than the sum of its proper divisors (1248152).

1557880918801 is an frugal number, since it uses more digits than its factorization.

1557880918801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496302 (or 1248151 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 61.

The spelling of 1557880918801 in words is "one trillion, five hundred fifty-seven billion, eight hundred eighty million, nine hundred eighteen thousand, eight hundred one".