661336152 has 16 divisors (see below), whose sum is σ = 1653340440. Its totient is φ = 220445376.

The previous prime is 661336147. The next prime is 661336153. The reversal of 661336152 is 251633166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661336153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13777813 + ... + 13777860.

Almost surely, 2^661336152 is an apocalyptic number.

It is an amenable number.

661336152 is an abundant number, since it is smaller than the sum of its proper divisors (992004288).

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

661336152 is a wasteful number, since it uses less digits than its factorization.

661336152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27555682 (or 27555678 counting only the distinct ones).

The product of its digits is 19440, while the sum is 33.

The square root of 661336152 is about 25716.4568321532. The cubic root of 661336152 is about 871.2459147196.

The spelling of 661336152 in words is "six hundred sixty-one million, three hundred thirty-six thousand, one hundred fifty-two".