77155985961263 has 4 divisors (see below), whose sum is σ = 84170166503208. Its totient is φ = 70141805419320.

The previous prime is 77155985961193. The next prime is 77155985961281. The reversal of 77155985961263 is 36216958955177.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77155985961263 is a prime.

It is a super-2 number, since 2×77155985961263² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77155985961283) 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, 3507090270956 + ... + 3507090270977.

It is an arithmetic number, because the mean of its divisors is an integer number (21042541625802).

Almost surely, 2^{77155985961263} is an apocalyptic number.

77155985961263 is a deficient number, since it is larger than the sum of its proper divisors (7014180541945).

77155985961263 is a wasteful number, since it uses less digits than its factorization.

77155985961263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7014180541944.

The product of its digits is 857304000, while the sum is 74.

The spelling of 77155985961263 in words is "seventy-seven trillion, one hundred fifty-five billion, nine hundred eighty-five million, nine hundred sixty-one thousand, two hundred sixty-three".