15122215661 has 16 divisors (see below), whose sum is σ = 17366168448. Its totient is φ = 12899328000.

The previous prime is 15122215613. The next prime is 15122215687. The reversal of 15122215661 is 16651222151.

It is a cyclic number.

It is not a de Polignac number, because 15122215661 - 2⁶ = 15122215597 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 (15122215261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1237421 + ... + 1249581.

It is an arithmetic number, because the mean of its divisors is an integer number (1085385528).

Almost surely, 2^15122215661 is an apocalyptic number.

It is an amenable number.

15122215661 is a deficient number, since it is larger than the sum of its proper divisors (2243952787).

15122215661 is a wasteful number, since it uses less digits than its factorization.

15122215661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13012.

The product of its digits is 7200, while the sum is 32.

The spelling of 15122215661 in words is "fifteen billion, one hundred twenty-two million, two hundred fifteen thousand, six hundred sixty-one".