77691649917 has 16 divisors (see below), whose sum is σ = 118402445952. Its totient is φ = 44389539840.

The previous prime is 77691649897. The next prime is 77691649939. The reversal of 77691649917 is 71994619677.

It is not a de Polignac number, because 77691649917 - 2¹⁰ = 77691648893 is a prime.

It is a super-2 number, since 2×77691649917² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77691641917) 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, 66384 + ... + 399737.

It is an arithmetic number, because the mean of its divisors is an integer number (7400152872).

Almost surely, 2^77691649917 is an apocalyptic number.

It is an amenable number.

77691649917 is a deficient number, since it is larger than the sum of its proper divisors (40710796035).

77691649917 is a wasteful number, since it uses less digits than its factorization.

77691649917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474068.

The product of its digits is 36006768, while the sum is 66.

The spelling of 77691649917 in words is "seventy-seven billion, six hundred ninety-one million, six hundred forty-nine thousand, nine hundred seventeen".