645115871232 has 544 divisors, whose sum is σ = 2214911157760. Its totient is φ = 184032165888.

The previous prime is 645115871209. The next prime is 645115871251. The reversal of 645115871232 is 232178511546.

645115871232 is a `hidden beast` number, since 6 + 4 + 51 + 1 + 587 + 12 + 3 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1003290303 + ... + 1003290945.

Almost surely, 2^645115871232 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 645115871232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1107455578880).

645115871232 is an abundant number, since it is smaller than the sum of its proper divisors (1569795286528).

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

645115871232 is an frugal number, since it uses more digits than its factorization.

645115871232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703 (or 655 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The spelling of 645115871232 in words is "six hundred forty-five billion, one hundred fifteen million, eight hundred seventy-one thousand, two hundred thirty-two".