15500228657 has 2 divisors, whose sum is σ = 15500228658. Its totient is φ = 15500228656.

The previous prime is 15500228651. The next prime is 15500228659. The reversal of 15500228657 is 75682200551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11399619361 + 4100609296 = 106769^2 + 64036^2 .

It is an emirp because it is prime and its reverse (75682200551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15500228657 - 2⁴ = 15500228641 is a prime.

Together with 15500228659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15500228651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7750114328 + 7750114329.

It is an arithmetic number, because the mean of its divisors is an integer number (7750114329).

Almost surely, 2^15500228657 is an apocalyptic number.

It is an amenable number.

15500228657 is a deficient number, since it is larger than the sum of its proper divisors (1).

15500228657 is an equidigital number, since it uses as much as digits as its factorization.

15500228657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168000, while the sum is 41.

The spelling of 15500228657 in words is "fifteen billion, five hundred million, two hundred twenty-eight thousand, six hundred fifty-seven".