18503514972 has 72 divisors (see below), whose sum is σ = 47721033360. Its totient is φ = 6043115520.

The previous prime is 18503514959. The next prime is 18503514979. The reversal of 18503514972 is 27941530581.

18503514972 is a `hidden beast` number, since 1 + 8 + 503 + 51 + 4 + 97 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18503514979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1460947 + ... + 1473557.

It is an arithmetic number, because the mean of its divisors is an integer number (662792130).

Almost surely, 2^18503514972 is an apocalyptic number.

18503514972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18503514972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23860516680).

18503514972 is an abundant number, since it is smaller than the sum of its proper divisors (29217518388).

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

18503514972 is a wasteful number, since it uses less digits than its factorization.

18503514972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13443 (or 13438 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

It can be divided in two parts, 18503514 and 972, that added together give a triangular number (18504486 = T₆₀₈₃).

The spelling of 18503514972 in words is "eighteen billion, five hundred three million, five hundred fourteen thousand, nine hundred seventy-two".