80721604470245 has 8 divisors (see below), whose sum is σ = 96866009765016. Its totient is φ = 64577227309056.

The previous prime is 80721604470187. The next prime is 80721604470251. The reversal of 80721604470245 is 54207440612708.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 40068304982209 + 40653299488036 = 6329953^2 + 6375994^2 .

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 80721604470245 - 2¹⁰ = 80721604469221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80721604470193 and 80721604470202.

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, 99692 + ... + 12706421.

It is an arithmetic number, because the mean of its divisors is an integer number (12108251220627).

Almost surely, 2^{80721604470245} is an apocalyptic number.

It is an amenable number.

80721604470245 is a deficient number, since it is larger than the sum of its proper divisors (16144405294771).

80721604470245 is a wasteful number, since it uses less digits than its factorization.

80721604470245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14066791.

The product of its (nonzero) digits is 3010560, while the sum is 50.

The spelling of 80721604470245 in words is "eighty trillion, seven hundred twenty-one billion, six hundred four million, four hundred seventy thousand, two hundred forty-five".