18409964487 has 16 divisors (see below), whose sum is σ = 25175555328. Its totient is φ = 11960161920.

The previous prime is 18409964423. The next prime is 18409964509. The reversal of 18409964487 is 78446990481.

It is not a de Polignac number, because 18409964487 - 2⁶ = 18409964423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18409964487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18409964687) 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, 108939 + ... + 220652.

It is an arithmetic number, because the mean of its divisors is an integer number (1573472208).

Almost surely, 2^18409964487 is an apocalyptic number.

18409964487 is a deficient number, since it is larger than the sum of its proper divisors (6765590841).

18409964487 is a wasteful number, since it uses less digits than its factorization.

18409964487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330070.

The product of its (nonzero) digits is 13934592, while the sum is 60.

The spelling of 18409964487 in words is "eighteen billion, four hundred nine million, nine hundred sixty-four thousand, four hundred eighty-seven".