66902231 has 12 divisors (see below), whose sum is σ = 73735200. Its totient is φ = 60656640.

The previous prime is 66902219. The next prime is 66902243. The reversal of 66902231 is 13220966.

It is an interprime number because it is at equal distance from previous prime (66902219) and next prime (66902243).

It is not a de Polignac number, because 66902231 - 2⁶ = 66902167 is a prime.

It is a super-2 number, since 2×66902231² = 8951817025554722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66902194 and 66902203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66902431) 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, 86615 + ... + 87383.

It is an arithmetic number, because the mean of its divisors is an integer number (6144600).

Almost surely, 2^66902231 is an apocalyptic number.

66902231 is a deficient number, since it is larger than the sum of its proper divisors (6832969).

66902231 is a wasteful number, since it uses less digits than its factorization.

66902231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510 (or 1499 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 66902231 is about 8179.3783993651. The cubic root of 66902231 is about 405.9571549180.

The spelling of 66902231 in words is "sixty-six million, nine hundred two thousand, two hundred thirty-one".