64721648910 has 16 divisors (see below), whose sum is σ = 155331957456. Its totient is φ = 17259106368.

The previous prime is 64721648899. The next prime is 64721648977. The reversal of 64721648910 is 1984612746.

It is a super-3 number, since 3×64721648910³ (a number of 33 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64721648910.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1078694119 + ... + 1078694178.

It is an arithmetic number, because the mean of its divisors is an integer number (9708247341).

Almost surely, 2^64721648910 is an apocalyptic number.

64721648910 is an abundant number, since it is smaller than the sum of its proper divisors (90610308546).

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

64721648910 is a wasteful number, since it uses less digits than its factorization.

64721648910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157388307.

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 64721648910 in words is "sixty-four billion, seven hundred twenty-one million, six hundred forty-eight thousand, nine hundred ten".