645437764352 has 72 divisors (see below), whose sum is σ = 1295301923664. Its totient is φ = 320982994944.

The previous prime is 645437764343. The next prime is 645437764409. The reversal of 645437764352 is 253467734546.

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, 39220958 + ... + 39237410.

Almost surely, 2^645437764352 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645437764352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (647650961832).

645437764352 is an abundant number, since it is smaller than the sum of its proper divisors (649864159312).

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

645437764352 is a wasteful number, since it uses less digits than its factorization.

645437764352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17285 (or 17271 counting only the distinct ones).

The product of its digits is 50803200, while the sum is 56.

The spelling of 645437764352 in words is "six hundred forty-five billion, four hundred thirty-seven million, seven hundred sixty-four thousand, three hundred fifty-two".