158672920621 has 4 divisors (see below), whose sum is σ = 168006621852. Its totient is φ = 149339219392.

The previous prime is 158672920597. The next prime is 158672920687. The reversal of 158672920621 is 126029276851.

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 132451595721 + 26221324900 = 363939^2 + 161930^2 .

It is a cyclic number.

It is not a de Polignac number, because 158672920621 - 2¹⁷ = 158672789549 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 (158672920691) 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, 4666850590 + ... + 4666850623.

It is an arithmetic number, because the mean of its divisors is an integer number (42001655463).

Almost surely, 2^158672920621 is an apocalyptic number.

It is an amenable number.

158672920621 is a deficient number, since it is larger than the sum of its proper divisors (9333701231).

158672920621 is an equidigital number, since it uses as much as digits as its factorization.

158672920621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9333701230.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 158672920621 in words is "one hundred fifty-eight billion, six hundred seventy-two million, nine hundred twenty thousand, six hundred twenty-one".