645426010260 has 72 divisors (see below), whose sum is σ = 1960763444640. Its totient is φ = 171852397248.

The previous prime is 645426010259. The next prime is 645426010297. The reversal of 645426010260 is 62010624546.

645426010260 is a `hidden beast` number, since 6 + 4 + 5 + 42 + 601 + 0 + 2 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2601942 + ... + 2839181.

It is an arithmetic number, because the mean of its divisors is an integer number (27232825620).

Almost surely, 2^645426010260 is an apocalyptic number.

645426010260 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645426010260 is an abundant number, since it is smaller than the sum of its proper divisors (1315337434380).

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

645426010260 is a wasteful number, since it uses less digits than its factorization.

645426010260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5441797 (or 5441792 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 645426010260 in words is "six hundred forty-five billion, four hundred twenty-six million, ten thousand, two hundred sixty".