77344615881 has 45 divisors (see below), whose sum is σ = 125163462501. Its totient is φ = 47576662848.

The previous prime is 77344615861. The next prime is 77344615891. The reversal of 77344615881 is 18851644377.

The square root of 77344615881 is 278109.

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

77344615881 is a `hidden beast` number, since 7 + 73 + 446 + 1 + 58 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 17505671481 + 59838944400 = 132309^2 + 244620^2 .

It is not a de Polignac number, because 77344615881 - 2⁷ = 77344615753 is a prime.

It is a super-2 number, since 2×77344615881² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77344615801) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 32537565 + ... + 32539941.

Almost surely, 2^77344615881 is an apocalyptic number.

77344615881 is the 278109-th square number.

77344615881 is the 139055-th centered octagonal number.

It is an amenable number.

77344615881 is a deficient number, since it is larger than the sum of its proper divisors (47818846620).

77344615881 is an frugal number, since it uses more digits than its factorization.

77344615881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4792 (or 2393 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The spelling of 77344615881 in words is "seventy-seven billion, three hundred forty-four million, six hundred fifteen thousand, eight hundred eighty-one".