1561884160 has 80 divisors (see below), whose sum is σ = 3865859712. Its totient is φ = 604569600.

The previous prime is 1561884143. The next prime is 1561884187. The reversal of 1561884160 is 614881651.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 69520 + ... + 89200.

Almost surely, 2^1561884160 is an apocalyptic number.

1561884160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561884160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1932929856).

1561884160 is an abundant number, since it is smaller than the sum of its proper divisors (2303975552).

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

1561884160 is an equidigital number, since it uses as much as digits as its factorization.

1561884160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19735 (or 19719 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 1561884160 is about 39520.6801560904. The cubic root of 1561884160 is about 1160.2447363129.

The spelling of 1561884160 in words is "one billion, five hundred sixty-one million, eight hundred eighty-four thousand, one hundred sixty".