77444442561 has 8 divisors (see below), whose sum is σ = 103350722080. Its totient is φ = 51583895712.

The previous prime is 77444442533. The next prime is 77444442671. The reversal of 77444442561 is 16524444477.

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

It is not a de Polignac number, because 77444442561 - 2¹⁵ = 77444409793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77444442561.

It is not an unprimeable number, because it can be changed into a prime (77444442461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11429215 + ... + 11435988.

It is an arithmetic number, because the mean of its divisors is an integer number (12918840260).

Almost surely, 2^77444442561 is an apocalyptic number.

It is an amenable number.

77444442561 is a deficient number, since it is larger than the sum of its proper divisors (25906279519).

77444442561 is a wasteful number, since it uses less digits than its factorization.

77444442561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22866335.

The product of its digits is 3010560, while the sum is 48.

The spelling of 77444442561 in words is "seventy-seven billion, four hundred forty-four million, four hundred forty-two thousand, five hundred sixty-one".