201615660 has 36 divisors (see below), whose sum is σ = 611568048. Its totient is φ = 53764128.

The previous prime is 201615649. The next prime is 201615679. The reversal of 201615660 is 66516102.

It is a happy number.

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

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, 559864 + ... + 560223.

Almost surely, 2^201615660 is an apocalyptic number.

201615660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201615660 is an abundant number, since it is smaller than the sum of its proper divisors (409952388).

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

201615660 is a wasteful number, since it uses less digits than its factorization.

201615660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120102 (or 1120097 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 201615660 is about 14199.1429318815. The cubic root of 201615660 is about 586.3740656650.

The spelling of 201615660 in words is "two hundred one million, six hundred fifteen thousand, six hundred sixty".