1561634164 has 24 divisors (see below), whose sum is σ = 2759823360. Its totient is φ = 773138016.

The previous prime is 1561634147. The next prime is 1561634203. The reversal of 1561634164 is 4614361651.

It is a congruent number.

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, 280197 + ... + 285715.

It is an arithmetic number, because the mean of its divisors is an integer number (114992640).

Almost surely, 2^1561634164 is an apocalyptic number.

It is an amenable number.

1561634164 is a deficient number, since it is larger than the sum of its proper divisors (1198189196).

1561634164 is a wasteful number, since it uses less digits than its factorization.

1561634164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6207 (or 6205 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The square root of 1561634164 is about 39517.5171790941. The cubic root of 1561634164 is about 1160.1828298823.

The spelling of 1561634164 in words is "one billion, five hundred sixty-one million, six hundred thirty-four thousand, one hundred sixty-four".