18697550531478 has 512 divisors, whose sum is σ = 49878159851520. Its totient is φ = 4540922104320.

The previous prime is 18697550531449. The next prime is 18697550531573. The reversal of 18697550531478 is 87413505579681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 8175578451 + ... + 8175580737.

It is an arithmetic number, because the mean of its divisors is an integer number (97418280960).

Almost surely, 2^{18697550531478} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18697550531478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24939079925760).

18697550531478 is an abundant number, since it is smaller than the sum of its proper divisors (31180609320042).

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

18697550531478 is a wasteful number, since it uses less digits than its factorization.

18697550531478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2672.

The product of its (nonzero) digits is 254016000, while the sum is 69.

The spelling of 18697550531478 in words is "eighteen trillion, six hundred ninety-seven billion, five hundred fifty million, five hundred thirty-one thousand, four hundred seventy-eight".