158121801779 has 8 divisors (see below), whose sum is σ = 158381990640. Its totient is φ = 157861677600.

The previous prime is 158121801763. The next prime is 158121801787. The reversal of 158121801779 is 977108121851.

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 158121801779 - 2⁴ = 158121801763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (158121801749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8200652 + ... + 8219910.

It is an arithmetic number, because the mean of its divisors is an integer number (19797748830).

Almost surely, 2^158121801779 is an apocalyptic number.

158121801779 is a deficient number, since it is larger than the sum of its proper divisors (260188861).

158121801779 is a wasteful number, since it uses less digits than its factorization.

158121801779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32341.

The product of its (nonzero) digits is 282240, while the sum is 50.

The spelling of 158121801779 in words is "one hundred fifty-eight billion, one hundred twenty-one million, eight hundred one thousand, seven hundred seventy-nine".