55423566 has 36 divisors (see below), whose sum is σ = 131998776. Its totient is φ = 16794360.

The previous prime is 55423541. The next prime is 55423573. The reversal of 55423566 is 66532455.

It is a happy number.

55423566 is a `hidden beast` number, since 55 + 42 + 3 + 566 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55423566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10546 + ... + 14901.

Almost surely, 2^55423566 is an apocalyptic number.

55423566 is an abundant number, since it is smaller than the sum of its proper divisors (76575210).

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

55423566 is a wasteful number, since it uses less digits than its factorization.

55423566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25477 (or 25463 counting only the distinct ones).

The product of its digits is 108000, while the sum is 36.

The square root of 55423566 is about 7444.7005312504. The cubic root of 55423566 is about 381.2689939117.

Subtracting 55423566 from its reverse (66532455), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 5 and 5423566, that added together give a triangular number (5423571 = T₃₂₉₃).

The spelling of 55423566 in words is "fifty-five million, four hundred twenty-three thousand, five hundred sixty-six".