82721674457 has 4 divisors (see below), whose sum is σ = 85574146020. Its totient is φ = 79869202896.

The previous prime is 82721674439. The next prime is 82721674463. The reversal of 82721674457 is 75447612728.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 65523712576 + 17197961881 = 255976^2 + 131141^2 .

It is a cyclic number.

It is not a de Polignac number, because 82721674457 - 2⁶ = 82721674393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82721674399 and 82721674408.

It is not an unprimeable number, because it can be changed into a prime (82721674487) 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, 1426235738 + ... + 1426235795.

It is an arithmetic number, because the mean of its divisors is an integer number (21393536505).

Almost surely, 2^82721674457 is an apocalyptic number.

It is an amenable number.

82721674457 is a deficient number, since it is larger than the sum of its proper divisors (2852471563).

82721674457 is a wasteful number, since it uses less digits than its factorization.

82721674457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2852471562.

The product of its digits is 5268480, while the sum is 53.

The spelling of 82721674457 in words is "eighty-two billion, seven hundred twenty-one million, six hundred seventy-four thousand, four hundred fifty-seven".