645622704556 has 24 divisors (see below), whose sum is σ = 1179172118880. Its totient is φ = 308721359232.

The previous prime is 645622704527. The next prime is 645622704563. The reversal of 645622704556 is 655407226546.

It is a super-3 number, since 3×645622704556³ (a number of 36 digits) contains 333 as substring.

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, 97401 + ... + 1140496.

It is an arithmetic number, because the mean of its divisors is an integer number (49132171620).

Almost surely, 2^645622704556 is an apocalyptic number.

It is an amenable number.

645622704556 is a deficient number, since it is larger than the sum of its proper divisors (533549414324).

645622704556 is a wasteful number, since it uses less digits than its factorization.

645622704556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243593 (or 1243591 counting only the distinct ones).

The product of its (nonzero) digits is 12096000, while the sum is 52.

The spelling of 645622704556 in words is "six hundred forty-five billion, six hundred twenty-two million, seven hundred four thousand, five hundred fifty-six".