73663563481 has 8 divisors (see below), whose sum is σ = 78712282440. Its totient is φ = 68694352128.

The previous prime is 73663563431. The next prime is 73663563499. The reversal of 73663563481 is 18436536637.

It can be written as a sum of positive squares in 4 ways, for example, as 52059267225 + 21604296256 = 228165^2 + 146984^2 .

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 73663563481 - 2¹⁵ = 73663530713 is a prime.

It is a super-2 number, since 2×73663563481² (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 (73663563431) 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 7 ways as a sum of consecutive naturals, for example, 19874986 + ... + 19878691.

It is an arithmetic number, because the mean of its divisors is an integer number (9839035305).

Almost surely, 2^73663563481 is an apocalyptic number.

It is an amenable number.

73663563481 is a deficient number, since it is larger than the sum of its proper divisors (5048718959).

73663563481 is a wasteful number, since it uses less digits than its factorization.

73663563481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39753803.

The product of its digits is 6531840, while the sum is 52.

The spelling of 73663563481 in words is "seventy-three billion, six hundred sixty-three million, five hundred sixty-three thousand, four hundred eighty-one".