158799661 has 2 divisors, whose sum is σ = 158799662. Its totient is φ = 158799660.

The previous prime is 158799649. The next prime is 158799673. The reversal of 158799661 is 166997851.

It is a balanced prime because it is at equal distance from previous prime (158799649) and next prime (158799673).

It can be written as a sum of positive squares in only one way, i.e., 119486761 + 39312900 = 10931^2 + 6270^2 .

It is a cyclic number.

It is not a de Polignac number, because 158799661 - 2¹³ = 158791469 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 158799599 and 158799608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158799631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79399830 + 79399831.

It is an arithmetic number, because the mean of its divisors is an integer number (79399831).

Almost surely, 2^158799661 is an apocalyptic number.

It is an amenable number.

158799661 is a deficient number, since it is larger than the sum of its proper divisors (1).

158799661 is an equidigital number, since it uses as much as digits as its factorization.

158799661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 52.

The square root of 158799661 is about 12601.5737509249. The cubic root of 158799661 is about 541.5225219391.

The spelling of 158799661 in words is "one hundred fifty-eight million, seven hundred ninety-nine thousand, six hundred sixty-one".