18440352636 has 24 divisors (see below), whose sum is σ = 43141029120. Its totient is φ = 6130564272.

The previous prime is 18440352631. The next prime is 18440352677. The reversal of 18440352636 is 63625304481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18440352631) 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 7 ways as a sum of consecutive naturals, for example, 2022756 + ... + 2031851.

It is an arithmetic number, because the mean of its divisors is an integer number (1797542880).

Almost surely, 2^18440352636 is an apocalyptic number.

It is an amenable number.

18440352636 is an abundant number, since it is smaller than the sum of its proper divisors (24700676484).

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

18440352636 is a wasteful number, since it uses less digits than its factorization.

18440352636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4054993 (or 4054991 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 18440352636 in words is "eighteen billion, four hundred forty million, three hundred fifty-two thousand, six hundred thirty-six".