660695616 has 441 divisors, whose sum is σ = 2429053689. Its totient is φ = 177666048.

The previous prime is 660695597. The next prime is 660695617. The reversal of 660695616 is 616596066.

The square root of 660695616 is 25704.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 514382400 + 146313216 = 22680^2 + 12096^2 .

It is a tau number, because it is divible by the number of its divisors (441).

It is not an unprimeable number, because it can be changed into a prime (660695617) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 38864440 + ... + 38864456.

Almost surely, 2^660695616 is an apocalyptic number.

660695616 is the 25704-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660695616

660695616 is an abundant number, since it is smaller than the sum of its proper divisors (1768358073).

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

660695616 is an equidigital number, since it uses as much as digits as its factorization.

660695616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 29 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The cubic root of 660695616 is about 870.9645426119.

The spelling of 660695616 in words is "six hundred sixty million, six hundred ninety-five thousand, six hundred sixteen".