15216128399 has 2 divisors, whose sum is σ = 15216128400. Its totient is φ = 15216128398.

The previous prime is 15216128353. The next prime is 15216128429. The reversal of 15216128399 is 99382161251.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15216128399 - 2²⁸ = 14947692943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15216148399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7608064199 + 7608064200.

It is an arithmetic number, because the mean of its divisors is an integer number (7608064200).

Almost surely, 2^15216128399 is an apocalyptic number.

15216128399 is a deficient number, since it is larger than the sum of its proper divisors (1).

15216128399 is an equidigital number, since it uses as much as digits as its factorization.

15216128399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 47.

The spelling of 15216128399 in words is "fifteen billion, two hundred sixteen million, one hundred twenty-eight thousand, three hundred ninety-nine".