15662125121 has 2 divisors, whose sum is σ = 15662125122. Its totient is φ = 15662125120.

The previous prime is 15662125069. The next prime is 15662125139. The reversal of 15662125121 is 12152126651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10964393521 + 4697731600 = 104711^2 + 68540^2 .

It is a cyclic number.

It is not a de Polignac number, because 15662125121 - 2¹⁰ = 15662124097 is a prime.

It is not a weakly prime, because it can be changed into another prime (15662125151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7831062560 + 7831062561.

It is an arithmetic number, because the mean of its divisors is an integer number (7831062561).

Almost surely, 2^15662125121 is an apocalyptic number.

It is an amenable number.

15662125121 is a deficient number, since it is larger than the sum of its proper divisors (1).

15662125121 is an equidigital number, since it uses as much as digits as its factorization.

15662125121 is an evil number, because the sum of its binary digits is even.

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

The spelling of 15662125121 in words is "fifteen billion, six hundred sixty-two million, one hundred twenty-five thousand, one hundred twenty-one".