77357607681 has 16 divisors (see below), whose sum is σ = 107663114880. Its totient is φ = 49313383680.

The previous prime is 77357607673. The next prime is 77357607697. The reversal of 77357607681 is 18670675377.

It is a happy number.

It is not a de Polignac number, because 77357607681 - 2³ = 77357607673 is a prime.

It is a super-2 number, since 2×77357607681² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77357607611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31671 + ... + 394611.

It is an arithmetic number, because the mean of its divisors is an integer number (6728944680).

Almost surely, 2^77357607681 is an apocalyptic number.

It is an amenable number.

77357607681 is a deficient number, since it is larger than the sum of its proper divisors (30305507199).

77357607681 is a wasteful number, since it uses less digits than its factorization.

77357607681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366056.

The product of its (nonzero) digits is 10372320, while the sum is 57.

The spelling of 77357607681 in words is "seventy-seven billion, three hundred fifty-seven million, six hundred seven thousand, six hundred eighty-one".