18906924985 has 32 divisors (see below), whose sum is σ = 25733232000. Its totient is φ = 13220153856.

The previous prime is 18906924973. The next prime is 18906924997. The reversal of 18906924985 is 58942960981.

It is an interprime number because it is at equal distance from previous prime (18906924973) and next prime (18906924997).

It is not a de Polignac number, because 18906924985 - 2¹³ = 18906916793 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3627061 + ... + 3632269.

It is an arithmetic number, because the mean of its divisors is an integer number (804163500).

Almost surely, 2^18906924985 is an apocalyptic number.

It is an amenable number.

18906924985 is a deficient number, since it is larger than the sum of its proper divisors (6826307015).

18906924985 is a wasteful number, since it uses less digits than its factorization.

18906924985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8185.

The product of its (nonzero) digits is 11197440, while the sum is 61.

The spelling of 18906924985 in words is "eighteen billion, nine hundred six million, nine hundred twenty-four thousand, nine hundred eighty-five".