18697921286240 has 384 divisors, whose sum is σ = 54781615865088. Its totient is φ = 5883895480320.

The previous prime is 18697921286173. The next prime is 18697921286287. The reversal of 18697921286240 is 4268212979681.

It is a super-2 number, since 2×18697921286240² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2679933632 + ... + 2679940608.

It is an arithmetic number, because the mean of its divisors is an integer number (142660457982).

Almost surely, 2^{18697921286240} is an apocalyptic number.

18697921286240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18697921286240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27390807932544).

18697921286240 is an abundant number, since it is smaller than the sum of its proper divisors (36083694578848).

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

18697921286240 is a wasteful number, since it uses less digits than its factorization.

18697921286240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10490 (or 10482 counting only the distinct ones).

The product of its (nonzero) digits is 41803776, while the sum is 65.

The spelling of 18697921286240 in words is "eighteen trillion, six hundred ninety-seven billion, nine hundred twenty-one million, two hundred eighty-six thousand, two hundred forty".