15726532261 has 24 divisors (see below), whose sum is σ = 18396405720. Its totient is φ = 13387552640.

The previous prime is 15726532249. The next prime is 15726532309. The reversal of 15726532261 is 16223562751.

It can be written as a sum of positive squares in 4 ways, for example, as 12640729761 + 3085802500 = 112431^2 + 55550^2 .

It is not a de Polignac number, because 15726532261 - 2⁹ = 15726531749 is a prime.

Its product of digits (151200) is a multiple of the sum of its prime divisors (225).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15726532561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79830015 + ... + 79830211.

It is an arithmetic number, because the mean of its divisors is an integer number (766516905).

Almost surely, 2^15726532261 is an apocalyptic number.

15726532261 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

15726532261 is a deficient number, since it is larger than the sum of its proper divisors (2669873459).

15726532261 is an frugal number, since it uses more digits than its factorization.

15726532261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 225 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The spelling of 15726532261 in words is "fifteen billion, seven hundred twenty-six million, five hundred thirty-two thousand, two hundred sixty-one".