15442641561 has 4 divisors (see below), whose sum is σ = 20590188752. Its totient is φ = 10295094372.

The previous prime is 15442641553. The next prime is 15442641563. The reversal of 15442641561 is 16514624451.

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.

It is not a de Polignac number, because 15442641561 - 2³ = 15442641553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15442641563) 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, 2573773591 + ... + 2573773596.

It is an arithmetic number, because the mean of its divisors is an integer number (5147547188).

Almost surely, 2^15442641561 is an apocalyptic number.

It is an amenable number.

15442641561 is a deficient number, since it is larger than the sum of its proper divisors (5147547191).

15442641561 is an equidigital number, since it uses as much as digits as its factorization.

15442641561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5147547190.

The product of its digits is 115200, while the sum is 39.

The spelling of 15442641561 in words is "fifteen billion, four hundred forty-two million, six hundred forty-one thousand, five hundred sixty-one".