645222081394 has 16 divisors (see below), whose sum is σ = 1117924890336. Its totient is φ = 276030836800.

The previous prime is 645222081359. The next prime is 645222081407. The reversal of 645222081394 is 493180222546.

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, 862595992 + ... + 862596739.

It is an arithmetic number, because the mean of its divisors is an integer number (69870305646).

Almost surely, 2^645222081394 is an apocalyptic number.

645222081394 is a deficient number, since it is larger than the sum of its proper divisors (472702808942).

645222081394 is a wasteful number, since it uses less digits than its factorization.

645222081394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725192761.

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 645222081394 in words is "six hundred forty-five billion, two hundred twenty-two million, eighty-one thousand, three hundred ninety-four".