1561066604 has 24 divisors (see below), whose sum is σ = 2792645520. Its totient is φ = 763305984.

The previous prime is 1561066583. The next prime is 1561066621. The reversal of 1561066604 is 4066601651.

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, 28412 + ... + 62684.

It is an arithmetic number, because the mean of its divisors is an integer number (116360230).

Almost surely, 2^1561066604 is an apocalyptic number.

It is an amenable number.

1561066604 is a deficient number, since it is larger than the sum of its proper divisors (1231578916).

1561066604 is a wasteful number, since it uses less digits than its factorization.

1561066604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34529 (or 34527 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1561066604 is about 39510.3354073336. The cubic root of 1561066604 is about 1160.0422606482.

The spelling of 1561066604 in words is "one billion, five hundred sixty-one million, sixty-six thousand, six hundred four".