8221639172045 has 8 divisors (see below), whose sum is σ = 10624887545496. Its totient is φ = 6071364311616.

The previous prime is 8221639172039. The next prime is 8221639172053. The reversal of 8221639172045 is 5402719361228.

It can be written as a sum of positive squares in 4 ways, for example, as 1966448094601 + 6255191077444 = 1402301^2 + 2501038^2 .

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 8221639172045 - 2⁶ = 8221639171981 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8221639171984 and 8221639172002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63243378182 + ... + 63243378311.

It is an arithmetic number, because the mean of its divisors is an integer number (1328110943187).

It is a 1-persistent number, because it is pandigital, but 2⋅8221639172045 = 16443278344090 is not.

Almost surely, 2^{8221639172045} is an apocalyptic number.

It is an amenable number.

8221639172045 is a deficient number, since it is larger than the sum of its proper divisors (2403248373451).

8221639172045 is a wasteful number, since it uses less digits than its factorization.

8221639172045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126486756511.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 8221639172045 in words is "eight trillion, two hundred twenty-one billion, six hundred thirty-nine million, one hundred seventy-two thousand, forty-five".