1561465536 has 112 divisors (see below), whose sum is σ = 4364540928. Its totient is φ = 491904000.

The previous prime is 1561465523. The next prime is 1561465541. The reversal of 1561465536 is 6355641651.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252886 + ... + 258986.

Almost surely, 2^1561465536 is an apocalyptic number.

1561465536 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 1561465536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2182270464).

1561465536 is an abundant number, since it is smaller than the sum of its proper divisors (2803075392).

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

1561465536 is a wasteful number, since it uses less digits than its factorization.

1561465536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6190 (or 6180 counting only the distinct ones).

The product of its digits is 324000, while the sum is 42.

The square root of 1561465536 is about 39515.3835360357. The cubic root of 1561465536 is about 1160.1410688525.

The spelling of 1561465536 in words is "one billion, five hundred sixty-one million, four hundred sixty-five thousand, five hundred thirty-six".