645426403522 has 16 divisors (see below), whose sum is σ = 970713374400. Its totient is φ = 321855837840.

The previous prime is 645426403513. The next prime is 645426403543. The reversal of 645426403522 is 225304624546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2196372 + ... + 2472832.

It is an arithmetic number, because the mean of its divisors is an integer number (60669585900).

Almost surely, 2^645426403522 is an apocalyptic number.

645426403522 is a deficient number, since it is larger than the sum of its proper divisors (325286970878).

645426403522 is a wasteful number, since it uses less digits than its factorization.

645426403522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279561.

The product of its (nonzero) digits is 1382400, while the sum is 43.

The spelling of 645426403522 in words is "six hundred forty-five billion, four hundred twenty-six million, four hundred three thousand, five hundred twenty-two".