17949981931925 has 6 divisors (see below), whose sum is σ = 22257977595618. Its totient is φ = 14359985545520.

The previous prime is 17949981931867. The next prime is 17949981931939. The reversal of 17949981931925 is 52913918994971.

It can be written as a sum of positive squares in 3 ways, for example, as 5863575076324 + 12086406855601 = 2421482^2 + 3476551^2 .

It is not a de Polignac number, because 17949981931925 - 2²² = 17949977737621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 358999638614 + ... + 358999638663.

It is an arithmetic number, because the mean of its divisors is an integer number (3709662932603).

Almost surely, 2^{17949981931925} is an apocalyptic number.

It is an amenable number.

17949981931925 is a deficient number, since it is larger than the sum of its proper divisors (4307995663693).

17949981931925 is an equidigital number, since it uses as much as digits as its factorization.

17949981931925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717999277287 (or 717999277282 counting only the distinct ones).

The product of its digits is 396809280, while the sum is 77.

The spelling of 17949981931925 in words is "seventeen trillion, nine hundred forty-nine billion, nine hundred eighty-one million, nine hundred thirty-one thousand, nine hundred twenty-five".