158855724721 has 4 divisors (see below), whose sum is σ = 158856848500. Its totient is φ = 158854600944.

The previous prime is 158855724653. The next prime is 158855724751. The reversal of 158855724721 is 127427558851.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 107977960000 + 50877764721 = 328600^2 + 225561^2 .

It is a cyclic number.

It is not a de Polignac number, because 158855724721 - 2⁷ = 158855724593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158855724751) 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, 313146 + ... + 644803.

It is an arithmetic number, because the mean of its divisors is an integer number (39714212125).

Almost surely, 2^158855724721 is an apocalyptic number.

It is an amenable number.

158855724721 is a deficient number, since it is larger than the sum of its proper divisors (1123779).

158855724721 is an equidigital number, since it uses as much as digits as its factorization.

158855724721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123778.

The product of its digits is 6272000, while the sum is 55.

The spelling of 158855724721 in words is "one hundred fifty-eight billion, eight hundred fifty-five million, seven hundred twenty-four thousand, seven hundred twenty-one".