73509372018 has 16 divisors (see below), whose sum is σ = 163354160160. Its totient is φ = 24503123988.

The previous prime is 73509371963. The next prime is 73509372037. The reversal of 73509372018 is 81027390537.

It is a happy number.

73509372018 is a `hidden beast` number, since 7 + 350 + 93 + 7 + 201 + 8 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 680642280 + ... + 680642387.

It is an arithmetic number, because the mean of its divisors is an integer number (10209635010).

Almost surely, 2^73509372018 is an apocalyptic number.

73509372018 is an abundant number, since it is smaller than the sum of its proper divisors (89844788142).

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

73509372018 is a wasteful number, since it uses less digits than its factorization.

73509372018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361284678 (or 1361284672 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The spelling of 73509372018 in words is "seventy-three billion, five hundred nine million, three hundred seventy-two thousand, eighteen".