18634287431860 has 48 divisors (see below), whose sum is σ = 39205043171280. Its totient is φ = 7439815019520.

The previous prime is 18634287431839. The next prime is 18634287431867. The reversal of 18634287431860 is 6813478243681.

It can be written as a sum of positive squares in 8 ways, for example, as 313593280036 + 18320694151824 = 559994^2 + 4280268^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18634287431867) 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, 23838096 + ... + 24607384.

It is an arithmetic number, because the mean of its divisors is an integer number (816771732735).

Almost surely, 2^{18634287431860} is an apocalyptic number.

18634287431860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18634287431860 is an abundant number, since it is smaller than the sum of its proper divisors (20570755739420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18634287431860 is a wasteful number, since it uses less digits than its factorization.

18634287431860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771556 (or 771554 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 61.

The spelling of 18634287431860 in words is "eighteen trillion, six hundred thirty-four billion, two hundred eighty-seven million, four hundred thirty-one thousand, eight hundred sixty".