645466171 has 12 divisors (see below), whose sum is σ = 765018432. Its totient is φ = 542815728.

The previous prime is 645466169. The next prime is 645466177. The reversal of 645466171 is 171664546.

It is not a de Polignac number, because 645466171 - 2¹ = 645466169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645466177) 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, 121675 + ... + 126868.

It is an arithmetic number, because the mean of its divisors is an integer number (63751536).

Almost surely, 2^645466171 is an apocalyptic number.

645466171 is a deficient number, since it is larger than the sum of its proper divisors (119552261).

645466171 is a wasteful number, since it uses less digits than its factorization.

645466171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248610 (or 248603 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 645466171 is about 25406.0262733077. The cubic root of 645466171 is about 864.2203633695.

The spelling of 645466171 in words is "six hundred forty-five million, four hundred sixty-six thousand, one hundred seventy-one".