158969121977 has 2 divisors, whose sum is σ = 158969121978. Its totient is φ = 158969121976.

The previous prime is 158969121973. The next prime is 158969122069. The reversal of 158969121977 is 779121969851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87136545721 + 71832576256 = 295189^2 + 268016^2 .

It is a cyclic number.

It is not a de Polignac number, because 158969121977 - 2² = 158969121973 is a prime.

It is not a weakly prime, because it can be changed into another prime (158969121973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79484560988 + 79484560989.

It is an arithmetic number, because the mean of its divisors is an integer number (79484560989).

Almost surely, 2^158969121977 is an apocalyptic number.

It is an amenable number.

158969121977 is a deficient number, since it is larger than the sum of its proper divisors (1).

158969121977 is an equidigital number, since it uses as much as digits as its factorization.

158969121977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17146080, while the sum is 65.

The spelling of 158969121977 in words is "one hundred fifty-eight billion, nine hundred sixty-nine million, one hundred twenty-one thousand, nine hundred seventy-seven".