645726215000 has 80 divisors (see below), whose sum is σ = 1601932998600. Its totient is φ = 243096896000.

The previous prime is 645726214937. The next prime is 645726215009. The reversal of 645726215000 is 512627546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645726215009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3713390 + ... + 3883389.

Almost surely, 2^645726215000 is an apocalyptic number.

It is an amenable number.

645726215000 is an abundant number, since it is smaller than the sum of its proper divisors (956206783600).

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

645726215000 is a wasteful number, since it uses less digits than its factorization.

645726215000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7596822 (or 7596803 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 645726215000 in words is "six hundred forty-five billion, seven hundred twenty-six million, two hundred fifteen thousand".