661062560 has 24 divisors (see below), whose sum is σ = 1561760676. Its totient is φ = 264424960.

The previous prime is 661062539. The next prime is 661062601. The reversal of 661062560 is 65260166.

It can be written as a sum of positive squares in 2 ways, for example, as 579268624 + 81793936 = 24068^2 + 9044^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2065661 + ... + 2065980.

Almost surely, 2^661062560 is an apocalyptic number.

It is an amenable number.

661062560 is an abundant number, since it is smaller than the sum of its proper divisors (900698116).

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

661062560 is a wasteful number, since it uses less digits than its factorization.

661062560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4131656 (or 4131648 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 661062560 is about 25711.1368865712. The cubic root of 661062560 is about 871.1257545512.

The spelling of 661062560 in words is "six hundred sixty-one million, sixty-two thousand, five hundred sixty".