158721638399 has 8 divisors (see below), whose sum is σ = 165165601920. Its totient is φ = 152402800536.

The previous prime is 158721638353. The next prime is 158721638441. The reversal of 158721638399 is 993836127851.

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 158721638399 - 2³² = 154426671103 is a prime.

It is a super-2 number, since 2×158721638399² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158721638599) 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, 31278827 + ... + 31283900.

It is an arithmetic number, because the mean of its divisors is an integer number (20645700240).

Almost surely, 2^158721638399 is an apocalyptic number.

158721638399 is a deficient number, since it is larger than the sum of its proper divisors (6443963521).

158721638399 is an equidigital number, since it uses as much as digits as its factorization.

158721638399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62562829.

The product of its digits is 19595520, while the sum is 62.

The spelling of 158721638399 in words is "one hundred fifty-eight billion, seven hundred twenty-one million, six hundred thirty-eight thousand, three hundred ninety-nine".