77155099452 has 60 divisors (see below), whose sum is σ = 212314406920. Its totient is φ = 24364766304.

The previous prime is 77155099451. The next prime is 77155099493. The reversal of 77155099452 is 25499055177.

It is a happy number.

77155099452 is a `hidden beast` number, since 77 + 15 + 509 + 9 + 4 + 52 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77155099451) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6260503 + ... + 6272814.

Almost surely, 2^77155099452 is an apocalyptic number.

It is an amenable number.

77155099452 is an abundant number, since it is smaller than the sum of its proper divisors (135159307468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77155099452 is a wasteful number, since it uses less digits than its factorization.

77155099452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12533352 (or 12533341 counting only the distinct ones).

The product of its (nonzero) digits is 3969000, while the sum is 54.

The spelling of 77155099452 in words is "seventy-seven billion, one hundred fifty-five million, ninety-nine thousand, four hundred fifty-two".