82553755721 has 12 divisors (see below), whose sum is σ = 87268808340. Its totient is φ = 78077176320.

The previous prime is 82553755703. The next prime is 82553755733. The reversal of 82553755721 is 12755735528.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5830849600 + 76722906121 = 76360^2 + 276989^2 .

It is not a de Polignac number, because 82553755721 - 2⁶ = 82553755657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82553755721.

It is not an unprimeable number, because it can be changed into a prime (82553755421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 829640 + ... + 923801.

It is an arithmetic number, because the mean of its divisors is an integer number (7272400695).

Almost surely, 2^82553755721 is an apocalyptic number.

It is an amenable number.

82553755721 is a deficient number, since it is larger than the sum of its proper divisors (4715052619).

82553755721 is a wasteful number, since it uses less digits than its factorization.

82553755721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753576 (or 1753553 counting only the distinct ones).

The product of its digits is 2940000, while the sum is 50.

The spelling of 82553755721 in words is "eighty-two billion, five hundred fifty-three million, seven hundred fifty-five thousand, seven hundred twenty-one".