660965760 has 576 divisors, whose sum is σ = 2853658080. Its totient is φ = 138018816.

The previous prime is 660965759. The next prime is 660965777. The reversal of 660965760 is 67569066.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6814032 + ... + 6814128.

Almost surely, 2^660965760 is an apocalyptic number.

660965760 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 660965760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1426829040).

660965760 is an abundant number, since it is smaller than the sum of its proper divisors (2192692320).

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

660965760 is a wasteful number, since it uses less digits than its factorization.

660965760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 660965760 is about 25709.2543649169. The cubic root of 660965760 is about 871.0832325599.

The spelling of 660965760 in words is "six hundred sixty million, nine hundred sixty-five thousand, seven hundred sixty".