51661156 has 12 divisors (see below), whose sum is σ = 90682480. Its totient is φ = 25751880.

The previous prime is 51661153. The next prime is 51661219. The reversal of 51661156 is 65116615.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51661153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18186 + ... + 20833.

Almost surely, 2^51661156 is an apocalyptic number.

It is an amenable number.

51661156 is a deficient number, since it is larger than the sum of its proper divisors (39021324).

51661156 is a wasteful number, since it uses less digits than its factorization.

51661156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39354 (or 39352 counting only the distinct ones).

The product of its digits is 5400, while the sum is 31.

The square root of 51661156 is about 7187.5695474896. The cubic root of 51661156 is about 372.4386181759.

The spelling of 51661156 in words is "fifty-one million, six hundred sixty-one thousand, one hundred fifty-six".