158614610981 has 2 divisors, whose sum is σ = 158614610982. Its totient is φ = 158614610980.

The previous prime is 158614610939. The next prime is 158614611017. The reversal of 158614610981 is 189016416851.

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., 127705454881 + 30909156100 = 357359^2 + 175810^2 .

It is an emirp because it is prime and its reverse (189016416851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 158614610981 - 2³⁴ = 141434741797 is a prime.

It is a super-2 number, since 2×158614610981² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158614619981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79307305490 + 79307305491.

It is an arithmetic number, because the mean of its divisors is an integer number (79307305491).

Almost surely, 2^158614610981 is an apocalyptic number.

It is an amenable number.

158614610981 is a deficient number, since it is larger than the sum of its proper divisors (1).

158614610981 is an equidigital number, since it uses as much as digits as its factorization.

158614610981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 50.

The spelling of 158614610981 in words is "one hundred fifty-eight billion, six hundred fourteen million, six hundred ten thousand, nine hundred eighty-one".