158161157081821 has 8 divisors (see below), whose sum is σ = 171855926201600. Its totient is φ = 145003437731520.

The previous prime is 158161157081779. The next prime is 158161157081831. The reversal of 158161157081821 is 128180751161851.

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 158161157081821 - 2¹³ = 158161157073629 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 (158161157081831) 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, 134262441756 + ... + 134262442933.

It is an arithmetic number, because the mean of its divisors is an integer number (21481990775200).

Almost surely, 2^{158161157081821} is an apocalyptic number.

It is an amenable number.

158161157081821 is a deficient number, since it is larger than the sum of its proper divisors (13694769119779).

158161157081821 is a wasteful number, since it uses less digits than its factorization.

158161157081821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268524884739.

The product of its (nonzero) digits is 1075200, while the sum is 55.

The spelling of 158161157081821 in words is "one hundred fifty-eight trillion, one hundred sixty-one billion, one hundred fifty-seven million, eighty-one thousand, eight hundred twenty-one".