645635132502 has 32 divisors (see below), whose sum is σ = 1367419128192. Its totient is φ = 202523785344.

The previous prime is 645635132453. The next prime is 645635132503. The reversal of 645635132502 is 205231536546.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645635132503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 292713 + ... + 1173435.

It is an arithmetic number, because the mean of its divisors is an integer number (42731847756).

Almost surely, 2^645635132502 is an apocalyptic number.

645635132502 is an abundant number, since it is smaller than the sum of its proper divisors (721783995690).

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

645635132502 is a wasteful number, since it uses less digits than its factorization.

645635132502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887932.

The product of its (nonzero) digits is 648000, while the sum is 42.

The spelling of 645635132502 in words is "six hundred forty-five billion, six hundred thirty-five million, one hundred thirty-two thousand, five hundred two".