77155985961265 has 16 divisors (see below), whose sum is σ = 92693985510096. Its totient is φ = 61653600691200.

The previous prime is 77155985961193. The next prime is 77155985961281. The reversal of 77155985961265 is 56216958955177.

It can be written as a sum of positive squares in 8 ways, for example, as 35361778016929 + 41794207944336 = 5946577^2 + 6464844^2 .

It is not a de Polignac number, because 77155985961265 - 2⁴³ = 68359892939057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77155985961191 and 77155985961200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45196645 + ... + 46872685.

It is an arithmetic number, because the mean of its divisors is an integer number (5793374094381).

Almost surely, 2^{77155985961265} is an apocalyptic number.

It is an amenable number.

77155985961265 is a deficient number, since it is larger than the sum of its proper divisors (15537999548831).

77155985961265 is a wasteful number, since it uses less digits than its factorization.

77155985961265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686660.

The product of its digits is 1428840000, while the sum is 76.

The spelling of 77155985961265 in words is "seventy-seven trillion, one hundred fifty-five billion, nine hundred eighty-five million, nine hundred sixty-one thousand, two hundred sixty-five".