77577393649 has 16 divisors (see below), whose sum is σ = 95276297088. Its totient is φ = 61649356032.

The previous prime is 77577393629. The next prime is 77577393653. The reversal of 77577393649 is 94639377577.

It is a cyclic number.

It is not a de Polignac number, because 77577393649 - 2⁵ = 77577393617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (67).

It is not an unprimeable number, because it can be changed into a prime (77577393629) 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, 4857034 + ... + 4872979.

It is an arithmetic number, because the mean of its divisors is an integer number (5954768568).

Almost surely, 2^77577393649 is an apocalyptic number.

It is an amenable number.

77577393649 is a deficient number, since it is larger than the sum of its proper divisors (17698903439).

77577393649 is a wasteful number, since it uses less digits than its factorization.

77577393649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9730104.

The product of its digits is 210039480, while the sum is 67.

The spelling of 77577393649 in words is "seventy-seven billion, five hundred seventy-seven million, three hundred ninety-three thousand, six hundred forty-nine".