1561445262 has 80 divisors (see below), whose sum is σ = 3889640832. Its totient is φ = 464927040.

The previous prime is 1561445261. The next prime is 1561445269. The reversal of 1561445262 is 2625441651.

1561445262 is a `hidden beast` number, since 1 + 561 + 44 + 52 + 6 + 2 = 666.

It is a super-2 number, since 2×1561445262² = 4876222612444497288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561445261) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 53328 + ... + 77244.

Almost surely, 2^1561445262 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561445262, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1944820416).

1561445262 is an abundant number, since it is smaller than the sum of its proper divisors (2328195570).

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

1561445262 is a wasteful number, since it uses less digits than its factorization.

1561445262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23975 (or 23966 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 1561445262 is about 39515.1270022001. The cubic root of 1561445262 is about 1160.1360477572.

The spelling of 1561445262 in words is "one billion, five hundred sixty-one million, four hundred forty-five thousand, two hundred sixty-two".