1561681170 has 96 divisors (see below), whose sum is σ = 4655064960. Its totient is φ = 355829760.

The previous prime is 1561681169. The next prime is 1561681201. The reversal of 1561681170 is 711861651.

1561681170 is a `hidden beast` number, since 1 + 561 + 6 + 81 + 17 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 204786 + ... + 212274.

It is an arithmetic number, because the mean of its divisors is an integer number (48490260).

Almost surely, 2^1561681170 is an apocalyptic number.

1561681170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561681170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2327532480).

1561681170 is an abundant number, since it is smaller than the sum of its proper divisors (3093383790).

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

1561681170 is a wasteful number, since it uses less digits than its factorization.

1561681170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7840 (or 7837 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The square root of 1561681170 is about 39518.1119235219. Note that the first 3 decimals coincide. The cubic root of 1561681170 is about 1160.1944704675.

The spelling of 1561681170 in words is "one billion, five hundred sixty-one million, six hundred eighty-one thousand, one hundred seventy".