17949610975878 has 16 divisors (see below), whose sum is σ = 39888024390960. Its totient is φ = 5983203658608.

The previous prime is 17949610975867. The next prime is 17949610975963. The reversal of 17949610975878 is 87857901694971.

17949610975878 is a `hidden beast` number, since 1 + 7 + 9 + 496 + 1 + 0 + 9 + 7 + 58 + 78 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 17949610975797 and 17949610975806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166200101575 + ... + 166200101682.

It is an arithmetic number, because the mean of its divisors is an integer number (2493001524435).

Almost surely, 2^{17949610975878} is an apocalyptic number.

17949610975878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

17949610975878 is an abundant number, since it is smaller than the sum of its proper divisors (21938413415082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17949610975878 is a wasteful number, since it uses less digits than its factorization.

17949610975878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332400203268 (or 332400203262 counting only the distinct ones).

The product of its (nonzero) digits is 1920360960, while the sum is 81.

The spelling of 17949610975878 in words is "seventeen trillion, nine hundred forty-nine billion, six hundred ten million, nine hundred seventy-five thousand, eight hundred seventy-eight".