1660605564 has 12 divisors (see below), whose sum is σ = 3874746344. Its totient is φ = 553535184.

The previous prime is 1660605481. The next prime is 1660605571. The reversal of 1660605564 is 4655060661.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1660605564² = 5515221678375516192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69191887 + ... + 69191910.

Almost surely, 2^1660605564 is an apocalyptic number.

It is an amenable number.

1660605564 is an abundant number, since it is smaller than the sum of its proper divisors (2214140780).

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

1660605564 is a wasteful number, since it uses less digits than its factorization.

1660605564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138383804 (or 138383802 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 1660605564 is about 40750.5283892123. The cubic root of 1660605564 is about 1184.1921093424.

The spelling of 1660605564 in words is "one billion, six hundred sixty million, six hundred five thousand, five hundred sixty-four".