158166746921 has 2 divisors, whose sum is σ = 158166746922. Its totient is φ = 158166746920.

The previous prime is 158166746917. The next prime is 158166746971. The reversal of 158166746921 is 129647661851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157795645225 + 371101696 = 397235^2 + 19264^2 .

It is a cyclic number.

It is not a de Polignac number, because 158166746921 - 2² = 158166746917 is a prime.

It is not a weakly prime, because it can be changed into another prime (158166746971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79083373460 + 79083373461.

It is an arithmetic number, because the mean of its divisors is an integer number (79083373461).

Almost surely, 2^158166746921 is an apocalyptic number.

It is an amenable number.

158166746921 is a deficient number, since it is larger than the sum of its proper divisors (1).

158166746921 is an equidigital number, since it uses as much as digits as its factorization.

158166746921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 56.

The spelling of 158166746921 in words is "one hundred fifty-eight billion, one hundred sixty-six million, seven hundred forty-six thousand, nine hundred twenty-one".