15969967081 has 2 divisors, whose sum is σ = 15969967082. Its totient is φ = 15969967080.

The previous prime is 15969967061. The next prime is 15969967133. The reversal of 15969967081 is 18076996951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15355175056 + 614792025 = 123916^2 + 24795^2 .

It is a cyclic number.

It is not a de Polignac number, because 15969967081 - 2¹³ = 15969958889 is a prime.

It is a super-2 number, since 2×15969967081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15969967061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7984983540 + 7984983541.

It is an arithmetic number, because the mean of its divisors is an integer number (7984983541).

Almost surely, 2^15969967081 is an apocalyptic number.

It is an amenable number.

15969967081 is a deficient number, since it is larger than the sum of its proper divisors (1).

15969967081 is an equidigital number, since it uses as much as digits as its factorization.

15969967081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7348320, while the sum is 61.

The spelling of 15969967081 in words is "fifteen billion, nine hundred sixty-nine million, nine hundred sixty-seven thousand, eighty-one".