158869651967861 has 2 divisors, whose sum is σ = 158869651967862. Its totient is φ = 158869651967860.

The previous prime is 158869651967849. The next prime is 158869651968019. The reversal of 158869651967861 is 168769156968851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157918656431761 + 950995536100 = 12566569^2 + 975190^2 .

It is an emirp because it is prime and its reverse (168769156968851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158869651967861 - 2⁶ = 158869651967797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158869651987861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79434825983930 + 79434825983931.

It is an arithmetic number, because the mean of its divisors is an integer number (79434825983931).

Almost surely, 2^{158869651967861} is an apocalyptic number.

It is an amenable number.

158869651967861 is a deficient number, since it is larger than the sum of its proper divisors (1).

158869651967861 is an equidigital number, since it uses as much as digits as its factorization.

158869651967861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9405849600, while the sum is 86.

The spelling of 158869651967861 in words is "one hundred fifty-eight trillion, eight hundred sixty-nine billion, six hundred fifty-one million, nine hundred sixty-seven thousand, eight hundred sixty-one".