2377538720681 has 4 divisors (see below), whose sum is σ = 2377610981892. Its totient is φ = 2377466459472.

The previous prime is 2377538720659. The next prime is 2377538720737. The reversal of 2377538720681 is 1860278357732.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 385319389081 + 1992219331600 = 620741^2 + 1411460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2377538720681 is a prime.

It is a super-2 number, since 2×2377538720681² (a number of 26 digits) contains 22 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 2377538720681.

It is not an unprimeable number, because it can be changed into a prime (2377538720621) 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 3 ways as a sum of consecutive naturals, for example, 36081230 + ... + 36147063.

It is an arithmetic number, because the mean of its divisors is an integer number (594402745473).

Almost surely, 2^{2377538720681} is an apocalyptic number.

It is an amenable number.

2377538720681 is a deficient number, since it is larger than the sum of its proper divisors (72261211).

2377538720681 is an equidigital number, since it uses as much as digits as its factorization.

2377538720681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72261210.

The product of its (nonzero) digits is 23708160, while the sum is 59.

The spelling of 2377538720681 in words is "two trillion, three hundred seventy-seven billion, five hundred thirty-eight million, seven hundred twenty thousand, six hundred eighty-one".