158229428681 has 4 divisors (see below), whose sum is σ = 158231170500. Its totient is φ = 158227686864.

The previous prime is 158229428677. The next prime is 158229428699. The reversal of 158229428681 is 186824922851.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102618356281 + 55611072400 = 320341^2 + 235820^2 .

It is a cyclic number.

It is not a de Polignac number, because 158229428681 - 2² = 158229428677 is a prime.

It is a super-2 number, since 2×158229428681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158229428641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726686 + ... + 918983.

It is an arithmetic number, because the mean of its divisors is an integer number (39557792625).

Almost surely, 2^158229428681 is an apocalyptic number.

It is an amenable number.

158229428681 is a deficient number, since it is larger than the sum of its proper divisors (1741819).

158229428681 is an equidigital number, since it uses as much as digits as its factorization.

158229428681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1741818.

The product of its digits is 4423680, while the sum is 56.

The spelling of 158229428681 in words is "one hundred fifty-eight billion, two hundred twenty-nine million, four hundred twenty-eight thousand, six hundred eighty-one".