51556366 has 16 divisors (see below), whose sum is σ = 79608960. Its totient is φ = 25031160.

The previous prime is 51556331. The next prime is 51556369. The reversal of 51556366 is 66365515.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51556369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6805 + ... + 12223.

It is an arithmetic number, because the mean of its divisors is an integer number (4975560).

Almost surely, 2^51556366 is an apocalyptic number.

51556366 is a deficient number, since it is larger than the sum of its proper divisors (28052594).

51556366 is a wasteful number, since it uses less digits than its factorization.

51556366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5559.

The product of its digits is 81000, while the sum is 37.

The square root of 51556366 is about 7180.2761785324. The cubic root of 51556366 is about 372.1866283267.

The spelling of 51556366 in words is "fifty-one million, five hundred fifty-six thousand, three hundred sixty-six".