51155664 has 40 divisors (see below), whose sum is σ = 151032000. Its totient is φ = 14615808.

The previous prime is 51155641. The next prime is 51155677. The reversal of 51155664 is 46655115.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75789 + ... + 76460.

It is an arithmetic number, because the mean of its divisors is an integer number (3775800).

Almost surely, 2^51155664 is an apocalyptic number.

It is an amenable number.

51155664 is an abundant number, since it is smaller than the sum of its proper divisors (99876336).

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

51155664 is a wasteful number, since it uses less digits than its factorization.

51155664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152267 (or 152261 counting only the distinct ones).

The product of its digits is 18000, while the sum is 33.

The square root of 51155664 is about 7152.3187848417. The cubic root of 51155664 is about 371.2198937143.

The spelling of 51155664 in words is "fifty-one million, one hundred fifty-five thousand, six hundred sixty-four".