51665156 has 6 divisors (see below), whose sum is σ = 90414030. Its totient is φ = 25832576.

The previous prime is 51665149. The next prime is 51665191. The reversal of 51665156 is 65156615.

It can be written as a sum of positive squares in only one way, i.e., 51351556 + 313600 = 7166^2 + 560^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6458141 + ... + 6458148.

It is an arithmetic number, because the mean of its divisors is an integer number (15069005).

Almost surely, 2^51665156 is an apocalyptic number.

It is an amenable number.

51665156 is a deficient number, since it is larger than the sum of its proper divisors (38748874).

51665156 is a wasteful number, since it uses less digits than its factorization.

51665156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12916293 (or 12916291 counting only the distinct ones).

The product of its digits is 27000, while the sum is 35.

The square root of 51665156 is about 7187.8478002807. The cubic root of 51665156 is about 372.4482302722.

The spelling of 51665156 in words is "fifty-one million, six hundred sixty-five thousand, one hundred fifty-six".