645132156 has 24 divisors (see below), whose sum is σ = 1584535680. Its totient is φ = 203725872.

The previous prime is 645132151. The next prime is 645132161. The reversal of 645132156 is 651231546.

It is an interprime number because it is at equal distance from previous prime (645132151) and next prime (645132161).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645132151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1414536 + ... + 1414991.

It is an arithmetic number, because the mean of its divisors is an integer number (66022320).

Almost surely, 2^645132156 is an apocalyptic number.

It is an amenable number.

645132156 is an abundant number, since it is smaller than the sum of its proper divisors (939403524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645132156 is a wasteful number, since it uses less digits than its factorization.

645132156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2829553 (or 2829551 counting only the distinct ones).

The product of its digits is 21600, while the sum is 33.

The square root of 645132156 is about 25399.4518838498. The cubic root of 645132156 is about 864.0712657694.

The spelling of 645132156 in words is "six hundred forty-five million, one hundred thirty-two thousand, one hundred fifty-six".