77964788643 has 16 divisors (see below), whose sum is σ = 118810763520. Its totient is φ = 44548579296.

The previous prime is 77964788633. The next prime is 77964788653. The reversal of 77964788643 is 34688746977.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77964788633) and next prime (77964788653).

It is a de Polignac number, because none of the positive numbers 2^k-77964788643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77964788633) 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, 267013 + ... + 476681.

It is an arithmetic number, because the mean of its divisors is an integer number (7425672720).

Almost surely, 2^77964788643 is an apocalyptic number.

77964788643 is a deficient number, since it is larger than the sum of its proper divisors (40845974877).

77964788643 is a wasteful number, since it uses less digits than its factorization.

77964788643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227386.

The product of its digits is 341397504, while the sum is 69.

The spelling of 77964788643 in words is "seventy-seven billion, nine hundred sixty-four million, seven hundred eighty-eight thousand, six hundred forty-three".