645491556300 has 288 divisors, whose sum is σ = 1926164717568. Its totient is φ = 166816666880.

The previous prime is 645491556217. The next prime is 645491556317. The reversal of 645491556300 is 3655194546.

It is a self number, because there is not a number n which added to its sum of digits gives 645491556300.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1099644607 + ... + 1099645193.

It is an arithmetic number, because the mean of its divisors is an integer number (6688071936).

Almost surely, 2^645491556300 is an apocalyptic number.

645491556300 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645491556300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (963082358784).

645491556300 is an abundant number, since it is smaller than the sum of its proper divisors (1280673161268).

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

645491556300 is a wasteful number, since it uses less digits than its factorization.

645491556300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285 (or 1278 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 645491556300 in words is "six hundred forty-five billion, four hundred ninety-one million, five hundred fifty-six thousand, three hundred".