645622636505 has 16 divisors (see below), whose sum is σ = 965918542464. Its totient is φ = 402466058880.

The previous prime is 645622636481. The next prime is 645622636531. The reversal of 645622636505 is 505636226546.

It is not a de Polignac number, because 645622636505 - 2¹⁴ = 645622620121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 838470572 + ... + 838471341.

It is an arithmetic number, because the mean of its divisors is an integer number (60369908904).

Almost surely, 2^645622636505 is an apocalyptic number.

It is an amenable number.

645622636505 is a deficient number, since it is larger than the sum of its proper divisors (320295905959).

645622636505 is a wasteful number, since it uses less digits than its factorization.

645622636505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676941936.

The product of its (nonzero) digits is 7776000, while the sum is 50.

The spelling of 645622636505 in words is "six hundred forty-five billion, six hundred twenty-two million, six hundred thirty-six thousand, five hundred five".