15122122661 has 2 divisors, whose sum is σ = 15122122662. Its totient is φ = 15122122660.

The previous prime is 15122122651. The next prime is 15122122663. The reversal of 15122122661 is 16622122151.

15122122661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14159572036 + 962550625 = 118994^2 + 31025^2 .

It is a cyclic number.

It is not a de Polignac number, because 15122122661 - 2¹⁴ = 15122106277 is a prime.

Together with 15122122663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15122122663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7561061330 + 7561061331.

It is an arithmetic number, because the mean of its divisors is an integer number (7561061331).

Almost surely, 2^15122122661 is an apocalyptic number.

It is an amenable number.

15122122661 is a deficient number, since it is larger than the sum of its proper divisors (1).

15122122661 is an equidigital number, since it uses as much as digits as its factorization.

15122122661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 29.

The spelling of 15122122661 in words is "fifteen billion, one hundred twenty-two million, one hundred twenty-two thousand, six hundred sixty-one".