77023455961 has 3 divisors (see below), whose sum is σ = 77023733493. Its totient is φ = 77023178430.

The previous prime is 77023455911. The next prime is 77023455979. The reversal of 77023455961 is 16955432077.

The square root of 77023455961 is 277531.

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 77023455961 - 2⁷ = 77023455833 is a prime.

It is a super-2 number, since 2×77023455961² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77023455911) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 138766 + ... + 416296.

It is an arithmetic number, because the mean of its divisors is an integer number (25674577831).

Almost surely, 2^77023455961 is an apocalyptic number.

77023455961 is the 277531-st square number.

77023455961 is the 138766-th centered octagonal number.

It is an amenable number.

77023455961 is a deficient number, since it is larger than the sum of its proper divisors (277532).

77023455961 is an frugal number, since it uses more digits than its factorization.

77023455961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555062 (or 277531 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 49.

Multiplying 77023455961 by its sum of digits (49), we get a square (3774149342089 = 1942717²).

The spelling of 77023455961 in words is "seventy-seven billion, twenty-three million, four hundred fifty-five thousand, nine hundred sixty-one".