645464652636 has 48 divisors (see below), whose sum is σ = 1519633672704. Its totient is φ = 213219799296.

The previous prime is 645464652631. The next prime is 645464652653. The reversal of 645464652636 is 636256464546.

It is a happy number.

645464652636 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645464652631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10447011 + ... + 10508613.

It is an arithmetic number, because the mean of its divisors is an integer number (31659034848).

Almost surely, 2^645464652636 is an apocalyptic number.

It is an amenable number.

645464652636 is an abundant number, since it is smaller than the sum of its proper divisors (874169020068).

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

645464652636 is a wasteful number, since it uses less digits than its factorization.

645464652636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69450 (or 69448 counting only the distinct ones).

The product of its digits is 74649600, while the sum is 57.

The spelling of 645464652636 in words is "six hundred forty-five billion, four hundred sixty-four million, six hundred fifty-two thousand, six hundred thirty-six".