13818906381646 has 16 divisors (see below), whose sum is σ = 20738799960480. Its totient is φ = 6905973301920.

The previous prime is 13818906381557. The next prime is 13818906381673. The reversal of 13818906381646 is 64618360981831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183947140 + ... + 184022248.

It is an arithmetic number, because the mean of its divisors is an integer number (1296174997530).

Almost surely, 2^{13818906381646} is an apocalyptic number.

13818906381646 is a deficient number, since it is larger than the sum of its proper divisors (6919893578834).

13818906381646 is a wasteful number, since it uses less digits than its factorization.

13818906381646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120219.

The product of its (nonzero) digits is 35831808, while the sum is 64.

The spelling of 13818906381646 in words is "thirteen trillion, eight hundred eighteen billion, nine hundred six million, three hundred eighty-one thousand, six hundred forty-six".