660521070 has 96 divisors (see below), whose sum is σ = 1919290464. Its totient is φ = 156211200.

The previous prime is 660521063. The next prime is 660521087. The reversal of 660521070 is 70125066.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32454 + ... + 48726.

It is an arithmetic number, because the mean of its divisors is an integer number (19992609).

Almost surely, 2^660521070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660521070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (959645232).

660521070 is an abundant number, since it is smaller than the sum of its proper divisors (1258769394).

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

660521070 is a wasteful number, since it uses less digits than its factorization.

660521070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16338 (or 16335 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 660521070 is about 25700.6044675996. The cubic root of 660521070 is about 870.8878372109.

The spelling of 660521070 in words is "six hundred sixty million, five hundred twenty-one thousand, seventy".