73163826521 has 4 divisors (see below), whose sum is σ = 74544276132. Its totient is φ = 71783376912.

The previous prime is 73163826511. The next prime is 73163826553. The reversal of 73163826521 is 12562836137.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28573169296 + 44590657225 = 169036^2 + 211165^2 .

It is a cyclic number.

It is not a de Polignac number, because 73163826521 - 2⁶ = 73163826457 is a prime.

It is a super-2 number, since 2×73163826521² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73163826511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690224726 + ... + 690224831.

It is an arithmetic number, because the mean of its divisors is an integer number (18636069033).

Almost surely, 2^73163826521 is an apocalyptic number.

It is an amenable number.

73163826521 is a deficient number, since it is larger than the sum of its proper divisors (1380449611).

73163826521 is a wasteful number, since it uses less digits than its factorization.

73163826521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380449610.

The product of its digits is 362880, while the sum is 44.

The spelling of 73163826521 in words is "seventy-three billion, one hundred sixty-three million, eight hundred twenty-six thousand, five hundred twenty-one".