73994217545 has 8 divisors (see below), whose sum is σ = 89708454024. Its totient is φ = 58585112064.

The previous prime is 73994217469. The next prime is 73994217553. The reversal of 73994217545 is 54571249937.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21641104 + 73972576441 = 4652^2 + 271979^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 73994217545 - 2¹⁰ = 73994216521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76282214 + ... + 76283183.

It is an arithmetic number, because the mean of its divisors is an integer number (11213556753).

Almost surely, 2^73994217545 is an apocalyptic number.

It is an amenable number.

73994217545 is a deficient number, since it is larger than the sum of its proper divisors (15714236479).

73994217545 is a wasteful number, since it uses less digits than its factorization.

73994217545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152565499.

The product of its digits is 9525600, while the sum is 56.

The spelling of 73994217545 in words is "seventy-three billion, nine hundred ninety-four million, two hundred seventeen thousand, five hundred forty-five".