77156672550 has 48 divisors (see below), whose sum is σ = 191861685840. Its totient is φ = 20519936640.

The previous prime is 77156672521. The next prime is 77156672563. The reversal of 77156672550 is 5527665177.

It is a junction number, because it is equal to n+sod(n) for n = 77156672493 and 77156672502.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 633565 + ... + 745464.

It is an arithmetic number, because the mean of its divisors is an integer number (3997118455).

Almost surely, 2^77156672550 is an apocalyptic number.

77156672550 is an abundant number, since it is smaller than the sum of its proper divisors (114705013290).

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

77156672550 is a wasteful number, since it uses less digits than its factorization.

77156672550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379417 (or 1379412 counting only the distinct ones).

The product of its (nonzero) digits is 3087000, while the sum is 51.

The spelling of 77156672550 in words is "seventy-seven billion, one hundred fifty-six million, six hundred seventy-two thousand, five hundred fifty".