15220738823 has 4 divisors (see below), whose sum is σ = 16021830360. Its totient is φ = 14419647288.

The previous prime is 15220738811. The next prime is 15220738837. The reversal of 15220738823 is 32883702251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32883702251 = 59119 ⋅556229.

It is a cyclic number.

It is not a de Polignac number, because 15220738823 - 2⁸ = 15220738567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15220732823) 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, 400545740 + ... + 400545777.

It is an arithmetic number, because the mean of its divisors is an integer number (4005457590).

Almost surely, 2^15220738823 is an apocalyptic number.

15220738823 is a deficient number, since it is larger than the sum of its proper divisors (801091537).

15220738823 is an equidigital number, since it uses as much as digits as its factorization.

15220738823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801091536.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 15220738823 in words is "fifteen billion, two hundred twenty million, seven hundred thirty-eight thousand, eight hundred twenty-three".