1661500604 has 12 divisors (see below), whose sum is σ = 2962487304. Its totient is φ = 815075664.

The previous prime is 1661500591. The next prime is 1661500609. The reversal of 1661500604 is 4060051661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661500609) 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, 3918422 + ... + 3918845.

It is an arithmetic number, because the mean of its divisors is an integer number (246873942).

Almost surely, 2^1661500604 is an apocalyptic number.

It is an amenable number.

1661500604 is a deficient number, since it is larger than the sum of its proper divisors (1300986700).

1661500604 is a wasteful number, since it uses less digits than its factorization.

1661500604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7837324 (or 7837322 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1661500604 is about 40761.5088533288. The cubic root of 1661500604 is about 1184.4048247041.

The spelling of 1661500604 in words is "one billion, six hundred sixty-one million, five hundred thousand, six hundred four".