66557052 has 30 divisors (see below), whose sum is σ = 173994128. Its totient is φ = 22185576.

The previous prime is 66557047. The next prime is 66557069. The reversal of 66557052 is 25075566.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 66556998 and 66557016.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 102388 + ... + 103035.

Almost surely, 2^66557052 is an apocalyptic number.

It is an amenable number.

66557052 is an abundant number, since it is smaller than the sum of its proper divisors (107437076).

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

66557052 is a wasteful number, since it uses less digits than its factorization.

66557052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205439 (or 205428 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The square root of 66557052 is about 8158.2505477584. The cubic root of 66557052 is about 405.2577782788.

The spelling of 66557052 in words is "sixty-six million, five hundred fifty-seven thousand, fifty-two".