73563610721 has 8 divisors (see below), whose sum is σ = 74014214400. Its totient is φ = 73113127648.

The previous prime is 73563610709. The next prime is 73563610733. The reversal of 73563610721 is 12701636537.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (73563610709) and next prime (73563610733).

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 73563610721 - 2⁶ = 73563610657 is a prime.

It is a super-2 number, since 2×73563610721² (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 (73563610781) 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, 1399880 + ... + 1451478.

It is an arithmetic number, because the mean of its divisors is an integer number (9251776800).

Almost surely, 2^73563610721 is an apocalyptic number.

It is an amenable number.

73563610721 is a deficient number, since it is larger than the sum of its proper divisors (450603679).

73563610721 is a wasteful number, since it uses less digits than its factorization.

73563610721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60303.

The product of its (nonzero) digits is 158760, while the sum is 41.

The spelling of 73563610721 in words is "seventy-three billion, five hundred sixty-three million, six hundred ten thousand, seven hundred twenty-one".