53551566 has 24 divisors (see below), whose sum is σ = 117228384. Its totient is φ = 17665920.

The previous prime is 53551549. The next prime is 53551577. The reversal of 53551566 is 66515535.

53551566 is a `hidden beast` number, since 53 + 551 + 56 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 53551566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13590 + ... + 17081.

It is an arithmetic number, because the mean of its divisors is an integer number (4884516).

Almost surely, 2^53551566 is an apocalyptic number.

53551566 is an abundant number, since it is smaller than the sum of its proper divisors (63676818).

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

53551566 is a wasteful number, since it uses less digits than its factorization.

53551566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30776 (or 30773 counting only the distinct ones).

The product of its digits is 67500, while the sum is 36.

The square root of 53551566 is about 7317.8935493761. The cubic root of 53551566 is about 376.9271248746.

The spelling of 53551566 in words is "fifty-three million, five hundred fifty-one thousand, five hundred sixty-six".