661142960 has 40 divisors (see below), whose sum is σ = 1539257136. Its totient is φ = 264096000.

The previous prime is 661142959. The next prime is 661142987. The reversal of 661142960 is 69241166.

661142960 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×661142960² = 874220027115123200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 661142960.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57710 + ... + 68210.

Almost surely, 2^661142960 is an apocalyptic number.

It is an amenable number.

661142960 is an abundant number, since it is smaller than the sum of its proper divisors (878114176).

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

661142960 is a wasteful number, since it uses less digits than its factorization.

661142960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11301 (or 11295 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 661142960 is about 25712.7003638280. The cubic root of 661142960 is about 871.1610692479.

The spelling of 661142960 in words is "six hundred sixty-one million, one hundred forty-two thousand, nine hundred sixty".