661548516 has 48 divisors (see below), whose sum is σ = 1559943168. Its totient is φ = 218196000.

The previous prime is 661548499. The next prime is 661548521. The reversal of 661548516 is 615845166.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 599221 + ... + 600323.

It is an arithmetic number, because the mean of its divisors is an integer number (32498816).

Almost surely, 2^661548516 is an apocalyptic number.

It is an amenable number.

661548516 is an abundant number, since it is smaller than the sum of its proper divisors (898394652).

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

661548516 is a wasteful number, since it uses less digits than its factorization.

661548516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1592 (or 1590 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The square root of 661548516 is about 25720.5854521238. The cubic root of 661548516 is about 871.3391610292.

The spelling of 661548516 in words is "six hundred sixty-one million, five hundred forty-eight thousand, five hundred sixteen".