721163369761 has 8 divisors (see below), whose sum is σ = 721706731200. Its totient is φ = 720620179440.

The previous prime is 721163369753. The next prime is 721163369767. The reversal of 721163369761 is 167963361127.

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 721163369761 - 2³ = 721163369753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 721163369699 and 721163369708.

It is not an unprimeable number, because it can be changed into a prime (721163369767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9114870 + ... + 9193648.

It is an arithmetic number, because the mean of its divisors is an integer number (90213341400).

Almost surely, 2^721163369761 is an apocalyptic number.

It is an amenable number.

721163369761 is a deficient number, since it is larger than the sum of its proper divisors (543361439).

721163369761 is a wasteful number, since it uses less digits than its factorization.

721163369761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85559.

The product of its digits is 1714608, while the sum is 52.

The spelling of 721163369761 in words is "seven hundred twenty-one billion, one hundred sixty-three million, three hundred sixty-nine thousand, seven hundred sixty-one".