8721672563519 has 4 divisors (see below), whose sum is σ = 8723161671744. Its totient is φ = 8720183455296.

The previous prime is 8721672563467. The next prime is 8721672563557. The reversal of 8721672563519 is 9153652761278.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8721672563519 is a prime.

It is a super-2 number, since 2×8721672563519² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721672560519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 744545327 + ... + 744557040.

It is an arithmetic number, because the mean of its divisors is an integer number (2180790417936).

Almost surely, 2^{8721672563519} is an apocalyptic number.

8721672563519 is a deficient number, since it is larger than the sum of its proper divisors (1489108225).

8721672563519 is a wasteful number, since it uses less digits than its factorization.

8721672563519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489108224.

The product of its digits is 38102400, while the sum is 62.

The spelling of 8721672563519 in words is "eight trillion, seven hundred twenty-one billion, six hundred seventy-two million, five hundred sixty-three thousand, five hundred nineteen".