645442475700 has 288 divisors, whose sum is σ = 2050158781440. Its totient is φ = 155482956800.

The previous prime is 645442475693. The next prime is 645442475767. The reversal of 645442475700 is 7574244546.

It is a self number, because there is not a number n which added to its sum of digits gives 645442475700.

It is a congruent number.

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, 493834447 + ... + 493835753.

It is an arithmetic number, because the mean of its divisors is an integer number (7118606880).

Almost surely, 2^645442475700 is an apocalyptic number.

645442475700 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 645442475700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1025079390720).

645442475700 is an abundant number, since it is smaller than the sum of its proper divisors (1404716305740).

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

645442475700 is a wasteful number, since it uses less digits than its factorization.

645442475700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2167 (or 2160 counting only the distinct ones).

The product of its (nonzero) digits is 3763200, while the sum is 48.

The spelling of 645442475700 in words is "six hundred forty-five billion, four hundred forty-two million, four hundred seventy-five thousand, seven hundred".