158697541421 has 2 divisors, whose sum is σ = 158697541422. Its totient is φ = 158697541420.

The previous prime is 158697541291. The next prime is 158697541433. The reversal of 158697541421 is 124145796851.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102455047396 + 56242494025 = 320086^2 + 237155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158697541421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158697541441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79348770710 + 79348770711.

It is an arithmetic number, because the mean of its divisors is an integer number (79348770711).

Almost surely, 2^158697541421 is an apocalyptic number.

It is an amenable number.

158697541421 is a deficient number, since it is larger than the sum of its proper divisors (1).

158697541421 is an equidigital number, since it uses as much as digits as its factorization.

158697541421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2419200, while the sum is 53.

The spelling of 158697541421 in words is "one hundred fifty-eight billion, six hundred ninety-seven million, five hundred forty-one thousand, four hundred twenty-one".