264650644640 has 48 divisors (see below), whose sum is σ = 633151572480. Its totient is φ = 104520249600.

The previous prime is 264650644637. The next prime is 264650644697. The reversal of 264650644640 is 46446056462.

264650644640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10456136 + ... + 10481415.

It is an arithmetic number, because the mean of its divisors is an integer number (13190657760).

Almost surely, 2^264650644640 is an apocalyptic number.

264650644640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

264650644640 is an abundant number, since it is smaller than the sum of its proper divisors (368500927840).

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

264650644640 is a wasteful number, since it uses less digits than its factorization.

264650644640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20937645 (or 20937637 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 47.

The spelling of 264650644640 in words is "two hundred sixty-four billion, six hundred fifty million, six hundred forty-four thousand, six hundred forty".