158959297809 has 27 divisors (see below), whose sum is σ = 248652968187. Its totient is φ = 97811537616.

The previous prime is 158959297787. The next prime is 158959297831. The reversal of 158959297809 is 908792959851.

It is a happy number.

The square root of 158959297809 is 398697.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (158959297787) and next prime (158959297831).

It can be written as a sum of positive squares in only one way, i.e., 23514689025 + 135444608784 = 153345^2 + 368028^2 .

It is not a de Polignac number, because 158959297809 - 2⁹ = 158959297297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (158959297879) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 15544072 + ... + 15554294.

Almost surely, 2^158959297809 is an apocalyptic number.

158959297809 is the 398697-th square number.

158959297809 is the 199349-th centered octagonal number.

It is an amenable number.

158959297809 is a deficient number, since it is larger than the sum of its proper divisors (89693670378).

158959297809 is an frugal number, since it uses more digits than its factorization.

158959297809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20478 (or 10239 counting only the distinct ones).

The product of its (nonzero) digits is 146966400, while the sum is 72.

It can be divided in two parts, 1589592 and 97809, that added together give a square (1687401 = 1299²).

The spelling of 158959297809 in words is "one hundred fifty-eight billion, nine hundred fifty-nine million, two hundred ninety-seven thousand, eight hundred nine".