73218550365 has 24 divisors (see below), whose sum is σ = 127312532568. Its totient is φ = 38926700160.

The previous prime is 73218550337. The next prime is 73218550381. The reversal of 73218550365 is 56305581237.

73218550365 is a `hidden beast` number, since 7 + 3 + 2 + 1 + 85 + 503 + 65 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1828588644 + 71389961721 = 42762^2 + 267189^2 .

It is not a de Polignac number, because 73218550365 - 2⁸ = 73218550109 is a prime.

It is a super-2 number, since 2×73218550365² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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 73218550365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2552106 + ... + 2580635.

It is an arithmetic number, because the mean of its divisors is an integer number (5304688857).

Almost surely, 2^73218550365 is an apocalyptic number.

It is an amenable number.

73218550365 is a deficient number, since it is larger than the sum of its proper divisors (54093982203).

73218550365 is a wasteful number, since it uses less digits than its factorization.

73218550365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5133069 (or 5133066 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The spelling of 73218550365 in words is "seventy-three billion, two hundred eighteen million, five hundred fifty thousand, three hundred sixty-five".