158273149721 has 2 divisors, whose sum is σ = 158273149722. Its totient is φ = 158273149720.

The previous prime is 158273149711. The next prime is 158273149799. The reversal of 158273149721 is 127941372851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157600266121 + 672883600 = 396989^2 + 25940^2 .

It is a cyclic number.

It is not a de Polignac number, because 158273149721 - 2²² = 158268955417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 158273149721.

It is not a weakly prime, because it can be changed into another prime (158273149711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79136574860 + 79136574861.

It is an arithmetic number, because the mean of its divisors is an integer number (79136574861).

Almost surely, 2^158273149721 is an apocalyptic number.

It is an amenable number.

158273149721 is a deficient number, since it is larger than the sum of its proper divisors (1).

158273149721 is an equidigital number, since it uses as much as digits as its factorization.

158273149721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 50.

The spelling of 158273149721 in words is "one hundred fifty-eight billion, two hundred seventy-three million, one hundred forty-nine thousand, seven hundred twenty-one".