77664211546 has 8 divisors (see below), whose sum is σ = 118694361204. Its totient is φ = 38099424480.

The previous prime is 77664211523. The next prime is 77664211549. The reversal of 77664211546 is 64511246677.

It can be written as a sum of positive squares in 2 ways, for example, as 68646620025 + 9017591521 = 262005^2 + 94961^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 77664211546.

It is not an unprimeable number, because it can be changed into a prime (77664211549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366340515 + ... + 366340726.

Almost surely, 2^77664211546 is an apocalyptic number.

77664211546 is a deficient number, since it is larger than the sum of its proper divisors (41030149658).

77664211546 is a wasteful number, since it uses less digits than its factorization.

77664211546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732681296.

The product of its digits is 1693440, while the sum is 49.

The spelling of 77664211546 in words is "seventy-seven billion, six hundred sixty-four million, two hundred eleven thousand, five hundred forty-six".