64664477184 has 160 divisors (see below), whose sum is σ = 189223246080. Its totient is φ = 19532316672.

The previous prime is 64664477173. The next prime is 64664477191. The reversal of 64664477184 is 48177446646.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 623064 + ... + 719400.

It is an arithmetic number, because the mean of its divisors is an integer number (1182645288).

Almost surely, 2^64664477184 is an apocalyptic number.

64664477184 is a gapful number since it is divisible by the number (64) 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 64664477184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94611623040).

64664477184 is an abundant number, since it is smaller than the sum of its proper divisors (124558768896).

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

64664477184 is a wasteful number, since it uses less digits than its factorization.

64664477184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96400 (or 96384 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 57.

The spelling of 64664477184 in words is "sixty-four billion, six hundred sixty-four million, four hundred seventy-seven thousand, one hundred eighty-four".