18272440485 has 160 divisors (see below), whose sum is σ = 36063498240. Its totient is φ = 8797082112.

The previous prime is 18272440481. The next prime is 18272440493. The reversal of 18272440485 is 58404427281.

It is not a de Polignac number, because 18272440485 - 2² = 18272440481 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18272440485.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18272440481) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 81939084 + ... + 81939306.

It is an arithmetic number, because the mean of its divisors is an integer number (225396864).

Almost surely, 2^18272440485 is an apocalyptic number.

18272440485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18272440485 is a deficient number, since it is larger than the sum of its proper divisors (17791057755).

18272440485 is a wasteful number, since it uses less digits than its factorization.

18272440485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 573440, while the sum is 45.

The spelling of 18272440485 in words is "eighteen billion, two hundred seventy-two million, four hundred forty thousand, four hundred eighty-five".