66979025 has 12 divisors (see below), whose sum is σ = 83356272. Its totient is φ = 53388240.

The previous prime is 66979021. The next prime is 66979027. The reversal of 66979025 is 52097966.

It is not a de Polignac number, because 66979025 - 2² = 66979021 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66979021) 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, 2342 + ... + 11808.

It is an arithmetic number, because the mean of its divisors is an integer number (6946356).

Almost surely, 2^66979025 is an apocalyptic number.

It is an amenable number.

66979025 is a deficient number, since it is larger than the sum of its proper divisors (16377247).

66979025 is a wasteful number, since it uses less digits than its factorization.

66979025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9760 (or 9755 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 66979025 is about 8184.0714195320. The cubic root of 66979025 is about 406.1124220531.

The spelling of 66979025 in words is "sixty-six million, nine hundred seventy-nine thousand, twenty-five".