661320562 has 24 divisors (see below), whose sum is σ = 1164739824. Its totient is φ = 280769832.

The previous prime is 661320547. The next prime is 661320563. The reversal of 661320562 is 265023166.

It is not an unprimeable number, because it can be changed into a prime (661320563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21048 + ... + 42019.

It is an arithmetic number, because the mean of its divisors is an integer number (48530826).

Almost surely, 2^661320562 is an apocalyptic number.

661320562 is a deficient number, since it is larger than the sum of its proper divisors (503419262).

661320562 is a wasteful number, since it uses less digits than its factorization.

661320562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63190 (or 63183 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 661320562 is about 25716.1537170705. The cubic root of 661320562 is about 871.2390685641.

The spelling of 661320562 in words is "six hundred sixty-one million, three hundred twenty thousand, five hundred sixty-two".