645165621230 has 16 divisors (see below), whose sum is σ = 1250628742944. Its totient is φ = 238214998560.

The previous prime is 645165621227. The next prime is 645165621241. The reversal of 645165621230 is 32126561546.

It is a happy number.

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, 2481406106 + ... + 2481406365.

It is an arithmetic number, because the mean of its divisors is an integer number (78164296434).

Almost surely, 2^645165621230 is an apocalyptic number.

645165621230 is a deficient number, since it is larger than the sum of its proper divisors (605463121714).

645165621230 is a wasteful number, since it uses less digits than its factorization.

645165621230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4962812491.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 645165621230 in words is "six hundred forty-five billion, one hundred sixty-five million, six hundred twenty-one thousand, two hundred thirty".