15897115061 has 2 divisors, whose sum is σ = 15897115062. Its totient is φ = 15897115060.

The previous prime is 15897115001. The next prime is 15897115063. The reversal of 15897115061 is 16051179851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14467518961 + 1429596100 = 120281^2 + 37810^2 .

It is a cyclic number.

It is not a de Polignac number, because 15897115061 - 2¹⁴ = 15897098677 is a prime.

It is a Sophie Germain prime.

Together with 15897115063, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15897115063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7948557530 + 7948557531.

It is an arithmetic number, because the mean of its divisors is an integer number (7948557531).

Almost surely, 2^15897115061 is an apocalyptic number.

It is an amenable number.

15897115061 is a deficient number, since it is larger than the sum of its proper divisors (1).

15897115061 is an equidigital number, since it uses as much as digits as its factorization.

15897115061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 44.

The spelling of 15897115061 in words is "fifteen billion, eight hundred ninety-seven million, one hundred fifteen thousand, sixty-one".