82417451621 has 4 divisors (see below), whose sum is σ = 83972497932. Its totient is φ = 80862405312.

The previous prime is 82417451587. The next prime is 82417451629. The reversal of 82417451621 is 12615471428.

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 66918446596 + 15499005025 = 258686^2 + 124495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82417451621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82417451629) 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, 777523076 + ... + 777523181.

It is an arithmetic number, because the mean of its divisors is an integer number (20993124483).

Almost surely, 2^82417451621 is an apocalyptic number.

It is an amenable number.

82417451621 is a deficient number, since it is larger than the sum of its proper divisors (1555046311).

82417451621 is a wasteful number, since it uses less digits than its factorization.

82417451621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555046310.

The product of its digits is 107520, while the sum is 41.

The spelling of 82417451621 in words is "eighty-two billion, four hundred seventeen million, four hundred fifty-one thousand, six hundred twenty-one".