15833440561 has 9 divisors (see below), whose sum is σ = 16402028331. Its totient is φ = 15283936584.

The previous prime is 15833440547. The next prime is 15833440573. The reversal of 15833440561 is 16504433851.

The square root of 15833440561 is 125831.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 8302672161 + 7530768400 = 91119^2 + 86780^2 .

It is not a de Polignac number, because 15833440561 - 2⁵ = 15833440529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15833440531) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3646930 + ... + 3651268.

Almost surely, 2^15833440561 is an apocalyptic number.

15833440561 is the 125831-st square number.

15833440561 is the 62916-th centered octagonal number.

It is an amenable number.

15833440561 is a deficient number, since it is larger than the sum of its proper divisors (568587770).

15833440561 is an frugal number, since it uses more digits than its factorization.

15833440561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8736 (or 4368 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 15833440561 in words is "fifteen billion, eight hundred thirty-three million, four hundred forty thousand, five hundred sixty-one".