158838661 has 2 divisors, whose sum is σ = 158838662. Its totient is φ = 158838660.

The previous prime is 158838653. The next prime is 158838671. The reversal of 158838661 is 166838851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145950561 + 12888100 = 12081^2 + 3590^2 .

It is a cyclic number.

It is not a de Polignac number, because 158838661 - 2³ = 158838653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (158838671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79419330 + 79419331.

It is an arithmetic number, because the mean of its divisors is an integer number (79419331).

Almost surely, 2^158838661 is an apocalyptic number.

It is an amenable number.

158838661 is a deficient number, since it is larger than the sum of its proper divisors (1).

158838661 is an equidigital number, since it uses as much as digits as its factorization.

158838661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 46.

The square root of 158838661 is about 12603.1210817004. The cubic root of 158838661 is about 541.5668495939.

The spelling of 158838661 in words is "one hundred fifty-eight million, eight hundred thirty-eight thousand, six hundred sixty-one".