158613661 has 2 divisors, whose sum is σ = 158613662. Its totient is φ = 158613660.

The previous prime is 158613659. The next prime is 158613667. The reversal of 158613661 is 166316851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99800100 + 58813561 = 9990^2 + 7669^2 .

It is a cyclic number.

It is not a de Polignac number, because 158613661 - 2¹ = 158613659 is a prime.

Together with 158613659, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 158613661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158613667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79306830 + 79306831.

It is an arithmetic number, because the mean of its divisors is an integer number (79306831).

Almost surely, 2^158613661 is an apocalyptic number.

It is an amenable number.

158613661 is a deficient number, since it is larger than the sum of its proper divisors (1).

158613661 is an equidigital number, since it uses as much as digits as its factorization.

158613661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 158613661 is about 12594.1915580159. The cubic root of 158613661 is about 541.3110132173.

The spelling of 158613661 in words is "one hundred fifty-eight million, six hundred thirteen thousand, six hundred sixty-one".