194872864979 has 4 divisors (see below), whose sum is σ = 209863085376. Its totient is φ = 179882644584.

The previous prime is 194872864939. The next prime is 194872864997. The reversal of 194872864979 is 979468278491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979468278491 = 967 ⋅1012893773.

It is a cyclic number.

It is not a de Polignac number, because 194872864979 - 2¹² = 194872860883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194872864939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7495110179 + ... + 7495110204.

It is an arithmetic number, because the mean of its divisors is an integer number (52465771344).

Almost surely, 2^194872864979 is an apocalyptic number.

194872864979 is a deficient number, since it is larger than the sum of its proper divisors (14990220397).

194872864979 is a wasteful number, since it uses less digits than its factorization.

194872864979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14990220396.

The product of its digits is 438939648, while the sum is 74.

The spelling of 194872864979 in words is "one hundred ninety-four billion, eight hundred seventy-two million, eight hundred sixty-four thousand, nine hundred seventy-nine".