77953390568 has 8 divisors (see below), whose sum is σ = 146162607330. Its totient is φ = 38976695280.

The previous prime is 77953390561. The next prime is 77953390597. The reversal of 77953390568 is 86509335977.

It can be written as a sum of positive squares in only one way, i.e., 75626100004 + 2327290564 = 275002^2 + 48242^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×77953390568² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77953390568.

It is not an unprimeable number, because it can be changed into a prime (77953390561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4872086903 + ... + 4872086918.

Almost surely, 2^77953390568 is an apocalyptic number.

It is an amenable number.

77953390568 is a deficient number, since it is larger than the sum of its proper divisors (68209216762).

77953390568 is a wasteful number, since it uses less digits than its factorization.

77953390568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9744173827 (or 9744173823 counting only the distinct ones).

The product of its (nonzero) digits is 42865200, while the sum is 62.

The spelling of 77953390568 in words is "seventy-seven billion, nine hundred fifty-three million, three hundred ninety thousand, five hundred sixty-eight".