15552697171961 has 2 divisors, whose sum is σ = 15552697171962. Its totient is φ = 15552697171960.

The previous prime is 15552697171939. The next prime is 15552697172029. The reversal of 15552697171961 is 16917179625551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11972015203600 + 3580681968361 = 3460060^2 + 1892269^2 .

It is a cyclic number.

It is not a de Polignac number, because 15552697171961 - 2⁶ = 15552697171897 is a prime.

It is a super-3 number, since 3×15552697171961³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (15552697171061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7776348585980 + 7776348585981.

It is an arithmetic number, because the mean of its divisors is an integer number (7776348585981).

Almost surely, 2^{15552697171961} is an apocalyptic number.

It is an amenable number.

15552697171961 is a deficient number, since it is larger than the sum of its proper divisors (1).

15552697171961 is an equidigital number, since it uses as much as digits as its factorization.

15552697171961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35721000, while the sum is 65.

The spelling of 15552697171961 in words is "fifteen trillion, five hundred fifty-two billion, six hundred ninety-seven million, one hundred seventy-one thousand, nine hundred sixty-one".