204171840878 has 32 divisors (see below), whose sum is σ = 334049548800. Its totient is φ = 93268034496.

The previous prime is 204171840833. The next prime is 204171840923. The reversal of 204171840878 is 878048171402.

It is an interprime number because it is at equal distance from previous prime (204171840833) and next prime (204171840923).

It is a super-2 number, since 2×204171840878² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 661751 + ... + 919922.

It is an arithmetic number, because the mean of its divisors is an integer number (10439048400).

Almost surely, 2^204171840878 is an apocalyptic number.

204171840878 is a deficient number, since it is larger than the sum of its proper divisors (129877707922).

204171840878 is a wasteful number, since it uses less digits than its factorization.

204171840878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581816.

The product of its (nonzero) digits is 802816, while the sum is 50.

The spelling of 204171840878 in words is "two hundred four billion, one hundred seventy-one million, eight hundred forty thousand, eight hundred seventy-eight".