154921923879 has 4 divisors (see below), whose sum is σ = 206562565176. Its totient is φ = 103281282584.

The previous prime is 154921923857. The next prime is 154921923887. The reversal of 154921923879 is 978329129451.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 154921923879 - 2⁵ = 154921923847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154921923179) 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, 25820320644 + ... + 25820320649.

It is an arithmetic number, because the mean of its divisors is an integer number (51640641294).

Almost surely, 2^154921923879 is an apocalyptic number.

154921923879 is a deficient number, since it is larger than the sum of its proper divisors (51640641297).

154921923879 is an equidigital number, since it uses as much as digits as its factorization.

154921923879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51640641296.

The product of its digits is 9797760, while the sum is 60.

The spelling of 154921923879 in words is "one hundred fifty-four billion, nine hundred twenty-one million, nine hundred twenty-three thousand, eight hundred seventy-nine".