645361992460 has 24 divisors (see below), whose sum is σ = 1364355896400. Its totient is φ = 256412280384.

The previous prime is 645361992437. The next prime is 645361992469. The reversal of 645361992460 is 64299163546.

It is not an unprimeable number, because it can be changed into a prime (645361992469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108279234 + ... + 108285193.

It is an arithmetic number, because the mean of its divisors is an integer number (56848162350).

Almost surely, 2^645361992460 is an apocalyptic number.

It is an amenable number.

645361992460 is an abundant number, since it is smaller than the sum of its proper divisors (718993903940).

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

645361992460 is a wasteful number, since it uses less digits than its factorization.

645361992460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216564585 (or 216564583 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 55.

The spelling of 645361992460 in words is "six hundred forty-five billion, three hundred sixty-one million, nine hundred ninety-two thousand, four hundred sixty".