645430422156 has 36 divisors (see below), whose sum is σ = 1630762077672. Its totient is φ = 198593975424.

The previous prime is 645430422127. The next prime is 645430422167. The reversal of 645430422156 is 651224034546.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159127761 + ... + 159131816.

It is an arithmetic number, because the mean of its divisors is an integer number (45298946602).

Almost surely, 2^645430422156 is an apocalyptic number.

It is an amenable number.

645430422156 is an abundant number, since it is smaller than the sum of its proper divisors (985331655516).

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

645430422156 is a wasteful number, since it uses less digits than its factorization.

645430422156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318259610 (or 318259595 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 42.

The spelling of 645430422156 in words is "six hundred forty-five billion, four hundred thirty million, four hundred twenty-two thousand, one hundred fifty-six".