64815944025660 has 48 divisors (see below), whose sum is σ = 181486363363200. Its totient is φ = 17284087921984.

The previous prime is 64815944025653. The next prime is 64815944025667. The reversal of 64815944025660 is 6652044951846.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (64815944025653) and next prime (64815944025667).

It is a super-2 number, since 2×64815944025660² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 64815944025594 and 64815944025603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64815944025667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1331131 + ... + 11463149.

It is an arithmetic number, because the mean of its divisors is an integer number (3780965903400).

Almost surely, 2^{64815944025660} is an apocalyptic number.

64815944025660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64815944025660 is an abundant number, since it is smaller than the sum of its proper divisors (116670419337540).

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

64815944025660 is a wasteful number, since it uses less digits than its factorization.

64815944025660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10238650 (or 10238648 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 60.

The spelling of 64815944025660 in words is "sixty-four trillion, eight hundred fifteen billion, nine hundred forty-four million, twenty-five thousand, six hundred sixty".