51115566 has 16 divisors (see below), whose sum is σ = 108244944. Its totient is φ = 16036224.

The previous prime is 51115543. The next prime is 51115577. The reversal of 51115566 is 66551115.

It is a super-2 number, since 2×51115566² = 5225602175000712, which contains 22 as substring.

It is a Curzon number.

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, 250465 + ... + 250668.

It is an arithmetic number, because the mean of its divisors is an integer number (6765309).

Almost surely, 2^51115566 is an apocalyptic number.

51115566 is an abundant number, since it is smaller than the sum of its proper divisors (57129378).

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

51115566 is a wasteful number, since it uses less digits than its factorization.

51115566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501155.

The product of its digits is 4500, while the sum is 30.

The square root of 51115566 is about 7149.5150884518. The cubic root of 51115566 is about 371.1228756780.

It can be divided in two parts, 51115 and 566, that added together give a triangular number (51681 = T₃₂₁).

The spelling of 51115566 in words is "fifty-one million, one hundred fifteen thousand, five hundred sixty-six".