66552939 has 24 divisors (see below), whose sum is σ = 99720192. Its totient is φ = 42726960.

The previous prime is 66552931. The next prime is 66552947. The reversal of 66552939 is 93925566.

66552939 is a `hidden beast` number, since 6 + 6 + 552 + 93 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (66552931) and next prime (66552947).

It is not a de Polignac number, because 66552939 - 2³ = 66552931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66552894 and 66552903.

It is not an unprimeable number, because it can be changed into a prime (66552931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72924 + ... + 73830.

It is an arithmetic number, because the mean of its divisors is an integer number (4155008).

Almost surely, 2^66552939 is an apocalyptic number.

66552939 is a deficient number, since it is larger than the sum of its proper divisors (33167253).

66552939 is a wasteful number, since it uses less digits than its factorization.

66552939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207 (or 1204 counting only the distinct ones).

The product of its digits is 437400, while the sum is 45.

The square root of 66552939 is about 8157.9984677616. The cubic root of 66552939 is about 405.2494302550.

The spelling of 66552939 in words is "sixty-six million, five hundred fifty-two thousand, nine hundred thirty-nine".