73517796521 has 8 divisors (see below), whose sum is σ = 79181061960. Its totient is φ = 67855681152.

The previous prime is 73517796503. The next prime is 73517796523. The reversal of 73517796521 is 12569771537.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25561614400 + 47956182121 = 159880^2 + 218989^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73517796521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (73517796523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152390 + ... + 412623.

It is an arithmetic number, because the mean of its divisors is an integer number (9897632745).

Almost surely, 2^73517796521 is an apocalyptic number.

It is an amenable number.

73517796521 is a deficient number, since it is larger than the sum of its proper divisors (5663265439).

73517796521 is a wasteful number, since it uses less digits than its factorization.

73517796521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575035.

The product of its digits is 2778300, while the sum is 53.

The spelling of 73517796521 in words is "seventy-three billion, five hundred seventeen million, seven hundred ninety-six thousand, five hundred twenty-one".