661033516 has 24 divisors (see below), whose sum is σ = 1359049104. Its totient is φ = 277356480.

The previous prime is 661033487. The next prime is 661033523. The reversal of 661033516 is 615330166.

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, 577255 + ... + 578398.

It is an arithmetic number, because the mean of its divisors is an integer number (56627046).

Almost surely, 2^661033516 is an apocalyptic number.

It is an amenable number.

661033516 is an abundant number, since it is smaller than the sum of its proper divisors (698015588).

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

661033516 is a wasteful number, since it uses less digits than its factorization.

661033516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155681 (or 1155679 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 661033516 is about 25710.5720667588. The cubic root of 661033516 is about 871.1129966326.

The spelling of 661033516 in words is "six hundred sixty-one million, thirty-three thousand, five hundred sixteen".