51556626 has 24 divisors (see below), whose sum is σ = 121861584. Its totient is φ = 15623160.

The previous prime is 51556621. The next prime is 51556643. The reversal of 51556626 is 62665515.

It is a happy number.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (51556621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129996 + ... + 130391.

It is an arithmetic number, because the mean of its divisors is an integer number (5077566).

Almost surely, 2^51556626 is an apocalyptic number.

51556626 is an abundant number, since it is smaller than the sum of its proper divisors (70304958).

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

51556626 is a wasteful number, since it uses less digits than its factorization.

51556626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260406 (or 260403 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 51556626 is about 7180.2942836628. The cubic root of 51556626 is about 372.1872539743.

Subtracting 51556626 from its reverse (62665515), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 5155 and 6626, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 51556626 in words is "fifty-one million, five hundred fifty-six thousand, six hundred twenty-six".