1561706496 has 360 divisors, whose sum is σ = 5520584160. Its totient is φ = 415236096.

The previous prime is 1561706483. The next prime is 1561706507. The reversal of 1561706496 is 6946071651.

1561706496 is a `hidden beast` number, since 156 + 1 + 7 + 0 + 6 + 496 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17547220 + ... + 17547308.

It is an arithmetic number, because the mean of its divisors is an integer number (15334956).

Almost surely, 2^1561706496 is an apocalyptic number.

1561706496 is a gapful number since it is divisible by the number (16) 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 1561706496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2760292080).

1561706496 is an abundant number, since it is smaller than the sum of its proper divisors (3958877664).

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

1561706496 is an equidigital number, since it uses as much as digits as its factorization.

1561706496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 1561706496 is about 39518.4323575721. The cubic root of 1561706496 is about 1160.2007421118.

The spelling of 1561706496 in words is "one billion, five hundred sixty-one million, seven hundred six thousand, four hundred ninety-six".