15542221161 has 4 divisors (see below), whose sum is σ = 20722961552. Its totient is φ = 10361480772.

The previous prime is 15542221139. The next prime is 15542221193. The reversal of 15542221161 is 16112224551.

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 15542221161 - 2⁹ = 15542220649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15542221061) 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, 2590370191 + ... + 2590370196.

It is an arithmetic number, because the mean of its divisors is an integer number (5180740388).

Almost surely, 2^15542221161 is an apocalyptic number.

It is an amenable number.

15542221161 is a deficient number, since it is larger than the sum of its proper divisors (5180740391).

15542221161 is an equidigital number, since it uses as much as digits as its factorization.

15542221161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5180740390.

The product of its digits is 4800, while the sum is 30.

The spelling of 15542221161 in words is "fifteen billion, five hundred forty-two million, two hundred twenty-one thousand, one hundred sixty-one".