1561066600 has 48 divisors (see below), whose sum is σ = 3820514400. Its totient is φ = 591560640.

The previous prime is 1561066583. The next prime is 1561066621. The reversal of 1561066600 is 66601651.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 201604 + ... + 209203.

It is an arithmetic number, because the mean of its divisors is an integer number (79594050).

Almost surely, 2^1561066600 is an apocalyptic number.

1561066600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1561066600 is an abundant number, since it is smaller than the sum of its proper divisors (2259447800).

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

1561066600 is a wasteful number, since it uses less digits than its factorization.

1561066600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410842 (or 410833 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1561066600 is about 39510.3353567139. The cubic root of 1561066600 is about 1160.0422596574.

The spelling of 1561066600 in words is "one billion, five hundred sixty-one million, sixty-six thousand, six hundred".