77775025505 has 16 divisors (see below), whose sum is σ = 99195957120. Its totient is φ = 58372990848.

The previous prime is 77775025501. The next prime is 77775025567. The reversal of 77775025505 is 50552057777.

It is a cyclic number.

It is not a de Polignac number, because 77775025505 - 2² = 77775025501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77775025501) 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, 3964412 + ... + 3983981.

It is an arithmetic number, because the mean of its divisors is an integer number (6199747320).

Almost surely, 2^77775025505 is an apocalyptic number.

It is an amenable number.

77775025505 is a deficient number, since it is larger than the sum of its proper divisors (21420931615).

77775025505 is a wasteful number, since it uses less digits than its factorization.

77775025505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7948520.

The product of its (nonzero) digits is 3001250, while the sum is 50.

The spelling of 77775025505 in words is "seventy-seven billion, seven hundred seventy-five million, twenty-five thousand, five hundred five".