66525939 has 12 divisors (see below), whose sum is σ = 96650736. Its totient is φ = 44093232.

The previous prime is 66525923. The next prime is 66525941. The reversal of 66525939 is 93952566.

66525939 is a `hidden beast` number, since 6 + 6 + 52 + 593 + 9 = 666.

It is not a de Polignac number, because 66525939 - 2⁴ = 66525923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66525894 and 66525903.

It is not an unprimeable number, because it can be changed into a prime (66525989) 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, 19807 + ... + 22920.

It is an arithmetic number, because the mean of its divisors is an integer number (8054228).

Almost surely, 2^66525939 is an apocalyptic number.

66525939 is a deficient number, since it is larger than the sum of its proper divisors (30124797).

66525939 is a wasteful number, since it uses less digits than its factorization.

66525939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42906 (or 42903 counting only the distinct ones).

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

The square root of 66525939 is about 8156.3434822229. The cubic root of 66525939 is about 405.1946206814.

The spelling of 66525939 in words is "sixty-six million, five hundred twenty-five thousand, nine hundred thirty-nine".