660515616 has 72 divisors (see below), whose sum is σ = 1881030060. Its totient is φ = 219856896.

The previous prime is 660515599. The next prime is 660515657. The reversal of 660515616 is 616515066.

660515616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 650250000 + 10265616 = 25500^2 + 3204^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 289456 + ... + 291728.

Almost surely, 2^660515616 is an apocalyptic number.

It is an amenable number.

660515616 is an abundant number, since it is smaller than the sum of its proper divisors (1220514444).

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

660515616 is a wasteful number, since it uses less digits than its factorization.

660515616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3298 (or 3287 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 660515616 is about 25700.4983609268. The cubic root of 660515616 is about 870.8854401966.

The spelling of 660515616 in words is "six hundred sixty million, five hundred fifteen thousand, six hundred sixteen".