77646069516 has 24 divisors (see below), whose sum is σ = 181647212544. Its totient is φ = 25814444560.

The previous prime is 77646069511. The next prime is 77646069539. The reversal of 77646069516 is 61596064677.

It is a happy number.

It is a super-2 number, since 2×77646069516² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (77646069511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8442540 + ... + 8451731.

It is an arithmetic number, because the mean of its divisors is an integer number (7568633856).

Almost surely, 2^77646069516 is an apocalyptic number.

It is an amenable number.

77646069516 is an abundant number, since it is smaller than the sum of its proper divisors (104001143028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77646069516 is a wasteful number, since it uses less digits than its factorization.

77646069516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16894661 (or 16894659 counting only the distinct ones).

The product of its (nonzero) digits is 11430720, while the sum is 57.

The spelling of 77646069516 in words is "seventy-seven billion, six hundred forty-six million, sixty-nine thousand, five hundred sixteen".