766556378550 has 72 divisors (see below), whose sum is σ = 2064776238720. Its totient is φ = 203889499200.

The previous prime is 766556378447. The next prime is 766556378563. The reversal of 766556378550 is 55873655667.

It is a happy number.

766556378550 is a `hidden beast` number, since 7 + 6 + 6 + 5 + 5 + 6 + 3 + 78 + 550 = 666.

766556378550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2014486 + ... + 2364585.

It is an arithmetic number, because the mean of its divisors is an integer number (28677447760).

Almost surely, 2^766556378550 is an apocalyptic number.

766556378550 is an abundant number, since it is smaller than the sum of its proper divisors (1298219860170).

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

766556378550 is a wasteful number, since it uses less digits than its factorization.

766556378550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379478 (or 4379470 counting only the distinct ones).

The product of its (nonzero) digits is 158760000, while the sum is 63.

The spelling of 766556378550 in words is "seven hundred sixty-six billion, five hundred fifty-six million, three hundred seventy-eight thousand, five hundred fifty".