73509309951816 has 32 divisors (see below), whose sum is σ = 183906347572800. Its totient is φ = 24485360291520.

The previous prime is 73509309951799. The next prime is 73509309951817. The reversal of 73509309951816 is 61815990390537.

It is not an unprimeable number, because it can be changed into a prime (73509309951817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1108905276 + ... + 1108971563.

It is an arithmetic number, because the mean of its divisors is an integer number (5747073361650).

Almost surely, 2^{73509309951816} is an apocalyptic number.

It is an amenable number.

73509309951816 is an abundant number, since it is smaller than the sum of its proper divisors (110397037620984).

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

73509309951816 is a wasteful number, since it uses less digits than its factorization.

73509309951816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217878229 (or 2217878225 counting only the distinct ones).

The product of its (nonzero) digits is 55112400, while the sum is 66.

The spelling of 73509309951816 in words is "seventy-three trillion, five hundred nine billion, three hundred nine million, nine hundred fifty-one thousand, eight hundred sixteen".