158442506861 has 8 divisors (see below), whose sum is σ = 158542996248. Its totient is φ = 158342056000.

The previous prime is 158442506857. The next prime is 158442506869. The reversal of 158442506861 is 168605244851.

It can be written as a sum of positive squares in 4 ways, for example, as 75487562500 + 82954944361 = 274750^2 + 288019^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 158442506861 - 2² = 158442506857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158442506869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13218491 + ... + 13230471.

It is an arithmetic number, because the mean of its divisors is an integer number (19817874531).

Almost surely, 2^158442506861 is an apocalyptic number.

It is an amenable number.

158442506861 is a deficient number, since it is larger than the sum of its proper divisors (100489387).

158442506861 is a wasteful number, since it uses less digits than its factorization.

158442506861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19263.

The product of its (nonzero) digits is 1843200, while the sum is 50.

The spelling of 158442506861 in words is "one hundred fifty-eight billion, four hundred forty-two million, five hundred six thousand, eight hundred sixty-one".