18220402487 has 16 divisors (see below), whose sum is σ = 21222492480. Its totient is φ = 15318281472.

The previous prime is 18220402481. The next prime is 18220402531. The reversal of 18220402487 is 78420402281.

It is a cyclic number.

It is not a de Polignac number, because 18220402487 - 2¹⁶ = 18220336951 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18220402487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220402481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1973939 + ... + 1983147.

It is an arithmetic number, because the mean of its divisors is an integer number (1326405780).

Almost surely, 2^18220402487 is an apocalyptic number.

18220402487 is a deficient number, since it is larger than the sum of its proper divisors (3002089993).

18220402487 is an equidigital number, since it uses as much as digits as its factorization.

18220402487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14602.

The product of its (nonzero) digits is 57344, while the sum is 38.

The spelling of 18220402487 in words is "eighteen billion, two hundred twenty million, four hundred two thousand, four hundred eighty-seven".