15388788050561 has 2 divisors, whose sum is σ = 15388788050562. Its totient is φ = 15388788050560.

The previous prime is 15388788050491. The next prime is 15388788050563. The reversal of 15388788050561 is 16505088788351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9426005232400 + 5962782818161 = 3070180^2 + 2441881^2 .

It is a cyclic number.

It is not a de Polignac number, because 15388788050561 - 2⁴² = 10990741539457 is a prime.

Together with 15388788050563, 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 (15388788050563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7694394025280 + 7694394025281.

It is an arithmetic number, because the mean of its divisors is an integer number (7694394025281).

Almost surely, 2^{15388788050561} is an apocalyptic number.

It is an amenable number.

15388788050561 is a deficient number, since it is larger than the sum of its proper divisors (1).

15388788050561 is an equidigital number, since it uses as much as digits as its factorization.

15388788050561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512000, while the sum is 65.

The spelling of 15388788050561 in words is "fifteen trillion, three hundred eighty-eight billion, seven hundred eighty-eight million, fifty thousand, five hundred sixty-one".