66394373025 has 48 divisors (see below), whose sum is σ = 111137672448. Its totient is φ = 34972392000.

The previous prime is 66394373021. The next prime is 66394373077. The reversal of 66394373025 is 52037349366.

It is not a de Polignac number, because 66394373025 - 2² = 66394373021 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66394373021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2057062 + ... + 2089088.

It is an arithmetic number, because the mean of its divisors is an integer number (2315368176).

Almost surely, 2^66394373025 is an apocalyptic number.

It is an amenable number.

66394373025 is a deficient number, since it is larger than the sum of its proper divisors (44743299423).

66394373025 is a wasteful number, since it uses less digits than its factorization.

66394373025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32382 (or 32377 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 48.

The spelling of 66394373025 in words is "sixty-six billion, three hundred ninety-four million, three hundred seventy-three thousand, twenty-five".