64660855460 has 24 divisors (see below), whose sum is σ = 135814182840. Its totient is φ = 25859316224.

The previous prime is 64660855387. The next prime is 64660855471. The reversal of 64660855460 is 6455806646.

It can be written as a sum of positive squares in 4 ways, for example, as 4908964096 + 59751891364 = 70064^2 + 244442^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64660855399 and 64660855408.

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 7 ways as a sum of consecutive naturals, for example, 207749 + ... + 415308.

It is an arithmetic number, because the mean of its divisors is an integer number (5658924285).

Almost surely, 2^64660855460 is an apocalyptic number.

It is an amenable number.

64660855460 is an abundant number, since it is smaller than the sum of its proper divisors (71153327380).

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

64660855460 is a wasteful number, since it uses less digits than its factorization.

64660855460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628255 (or 628253 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 50.

The spelling of 64660855460 in words is "sixty-four billion, six hundred sixty million, eight hundred fifty-five thousand, four hundred sixty".