645902071390 has 16 divisors (see below), whose sum is σ = 1200127720320. Its totient is φ = 250026608160.

The previous prime is 645902071349. The next prime is 645902071403. The reversal of 645902071390 is 93170209546.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 645902071390.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1041777225 + ... + 1041777844.

It is an arithmetic number, because the mean of its divisors is an integer number (75007982520).

Almost surely, 2^645902071390 is an apocalyptic number.

645902071390 is a deficient number, since it is larger than the sum of its proper divisors (554225648930).

645902071390 is a wasteful number, since it uses less digits than its factorization.

645902071390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2083555107.

The product of its (nonzero) digits is 408240, while the sum is 46.

The spelling of 645902071390 in words is "six hundred forty-five billion, nine hundred two million, seventy-one thousand, three hundred ninety".