645466941 has 32 divisors (see below), whose sum is σ = 1095859200. Its totient is φ = 367824240.

The previous prime is 645466919. The next prime is 645466973. The reversal of 645466941 is 149664546.

It is a happy number.

645466941 is a `hidden beast` number, since 6 + 4 + 546 + 69 + 41 = 666.

It is not a de Polignac number, because 645466941 - 2⁵ = 645466909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645466901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67126 + ... + 76136.

It is an arithmetic number, because the mean of its divisors is an integer number (34245600).

Almost surely, 2^645466941 is an apocalyptic number.

It is an amenable number.

645466941 is a deficient number, since it is larger than the sum of its proper divisors (450392259).

645466941 is a wasteful number, since it uses less digits than its factorization.

645466941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9406 (or 9400 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 645466941 is about 25406.0414271881. The cubic root of 645466941 is about 864.2207070227.

The spelling of 645466941 in words is "six hundred forty-five million, four hundred sixty-six thousand, nine hundred forty-one".