64731612660 has 192 divisors, whose sum is σ = 215854329600. Its totient is φ = 14286827520.

The previous prime is 64731612653. The next prime is 64731612679. The reversal of 64731612660 is 6621613746.

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 63 ways as a sum of consecutive naturals, for example, 574666 + ... + 678014.

It is an arithmetic number, because the mean of its divisors is an integer number (1124241300).

Almost surely, 2^64731612660 is an apocalyptic number.

64731612660 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 64731612660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107927164800).

64731612660 is an abundant number, since it is smaller than the sum of its proper divisors (151122716940).

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

64731612660 is a wasteful number, since it uses less digits than its factorization.

64731612660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103458 (or 103456 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 42.

The spelling of 64731612660 in words is "sixty-four billion, seven hundred thirty-one million, six hundred twelve thousand, six hundred sixty".