18426665786506 has 8 divisors (see below), whose sum is σ = 28841737752864. Its totient is φ = 8812753202220.

The previous prime is 18426665786449. The next prime is 18426665786533. The reversal of 18426665786506 is 60568756662481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200289845460 + ... + 200289845551.

It is an arithmetic number, because the mean of its divisors is an integer number (3605217219108).

Almost surely, 2^{18426665786506} is an apocalyptic number.

18426665786506 is a deficient number, since it is larger than the sum of its proper divisors (10415071966358).

18426665786506 is a wasteful number, since it uses less digits than its factorization.

18426665786506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400579691036.

The product of its (nonzero) digits is 696729600, while the sum is 70.

The spelling of 18426665786506 in words is "eighteen trillion, four hundred twenty-six billion, six hundred sixty-five million, seven hundred eighty-six thousand, five hundred six".