77653510668 has 18 divisors (see below), whose sum is σ = 196290818724. Its totient is φ = 25884503544.

The previous prime is 77653510643. The next prime is 77653510681. The reversal of 77653510668 is 86601535677.

77653510668 is a `hidden beast` number, since 7 + 7 + 65 + 3 + 510 + 6 + 68 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1078520946 + ... + 1078521017.

Almost surely, 2^77653510668 is an apocalyptic number.

It is an amenable number.

77653510668 is an abundant number, since it is smaller than the sum of its proper divisors (118637308056).

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

77653510668 is a wasteful number, since it uses less digits than its factorization.

77653510668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157041973 (or 2157041968 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 54.

The spelling of 77653510668 in words is "seventy-seven billion, six hundred fifty-three million, five hundred ten thousand, six hundred sixty-eight".