1561800612 has 24 divisors (see below), whose sum is σ = 3690332800. Its totient is φ = 514010016.

The previous prime is 1561800601. The next prime is 1561800613. The reversal of 1561800612 is 2160081651.

It is a self number, because there is not a number n which added to its sum of digits gives 1561800612.

It is not an unprimeable number, because it can be changed into a prime (1561800613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 822787 + ... + 824682.

Almost surely, 2^1561800612 is an apocalyptic number.

1561800612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1561800612 is an abundant number, since it is smaller than the sum of its proper divisors (2128532188).

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

1561800612 is a wasteful number, since it uses less digits than its factorization.

1561800612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1647555 (or 1647553 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 1561800612 is about 39519.6231257334. The cubic root of 1561800612 is about 1160.2240480830.

The spelling of 1561800612 in words is "one billion, five hundred sixty-one million, eight hundred thousand, six hundred twelve".