18351685001851 has 16 divisors (see below), whose sum is σ = 18559216472544. Its totient is φ = 18145346552064.

The previous prime is 18351685001849. The next prime is 18351685001927. The reversal of 18351685001851 is 15810058615381.

It is a cyclic number.

It is not a de Polignac number, because 18351685001851 - 2¹ = 18351685001849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18351685001821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39268780 + ... + 39733366.

It is an arithmetic number, because the mean of its divisors is an integer number (1159951029534).

Almost surely, 2^{18351685001851} is an apocalyptic number.

18351685001851 is a deficient number, since it is larger than the sum of its proper divisors (207531470693).

18351685001851 is a wasteful number, since it uses less digits than its factorization.

18351685001851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465870.

The product of its (nonzero) digits is 1152000, while the sum is 52.

The spelling of 18351685001851 in words is "eighteen trillion, three hundred fifty-one billion, six hundred eighty-five million, one thousand, eight hundred fifty-one".