15741532561 has 4 divisors (see below), whose sum is σ = 15744106224. Its totient is φ = 15738958900.

The previous prime is 15741532487. The next prime is 15741532613. The reversal of 15741532561 is 16523514751.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16523514751 = 61 ⋅270877291.

It is a cyclic number.

It is not a de Polignac number, because 15741532561 - 2²³ = 15733143953 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15241532561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1277635 + ... + 1289896.

It is an arithmetic number, because the mean of its divisors is an integer number (3936026556).

Almost surely, 2^15741532561 is an apocalyptic number.

It is an amenable number.

15741532561 is a deficient number, since it is larger than the sum of its proper divisors (2573663).

15741532561 is an equidigital number, since it uses as much as digits as its factorization.

15741532561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573662.

The product of its digits is 126000, while the sum is 40.

The spelling of 15741532561 in words is "fifteen billion, seven hundred forty-one million, five hundred thirty-two thousand, five hundred sixty-one".