661152636 has 36 divisors (see below), whose sum is σ = 1672334664. Its totient is φ = 220240800.

The previous prime is 661152629. The next prime is 661152697. The reversal of 661152636 is 636251166.

661152636 is a `hidden beast` number, since 6 + 6 + 1 + 15 + 2 + 636 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 661152636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60126 + ... + 70266.

Almost surely, 2^661152636 is an apocalyptic number.

It is an amenable number.

661152636 is an abundant number, since it is smaller than the sum of its proper divisors (1011182028).

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

661152636 is a wasteful number, since it uses less digits than its factorization.

661152636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11962 (or 11957 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 661152636 is about 25712.8885191843. Note that the first 3 decimals coincide. The cubic root of 661152636 is about 871.1653191172.

The spelling of 661152636 in words is "six hundred sixty-one million, one hundred fifty-two thousand, six hundred thirty-six".