204149011879 has 4 divisors (see below), whose sum is σ = 204150892576. Its totient is φ = 204147131184.

The previous prime is 204149011849. The next prime is 204149011889. The reversal of 204149011879 is 978110941402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204149011879 is a prime.

It is a super-2 number, since 2×204149011879² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204149011849) 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, 766854 + ... + 998179.

It is an arithmetic number, because the mean of its divisors is an integer number (51037723144).

Almost surely, 2^204149011879 is an apocalyptic number.

204149011879 is a deficient number, since it is larger than the sum of its proper divisors (1880697).

204149011879 is a wasteful number, since it uses less digits than its factorization.

204149011879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880696.

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 204149011879 in words is "two hundred four billion, one hundred forty-nine million, eleven thousand, eight hundred seventy-nine".