82545251587821 has 24 divisors (see below), whose sum is σ = 130071643412256. Its totient is φ = 50027295251040.

The previous prime is 82545251587807. The next prime is 82545251587879. The reversal of 82545251587821 is 12878515254528.

82545251587821 is a `hidden beast` number, since 8 + 2 + 5 + 4 + 5 + 25 + 1 + 587 + 8 + 21 = 666.

It is not a de Polignac number, because 82545251587821 - 2³¹ = 82543104104173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82545251587801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48738991 + ... + 50404163.

It is an arithmetic number, because the mean of its divisors is an integer number (5419651808844).

Almost surely, 2^{82545251587821} is an apocalyptic number.

It is an amenable number.

82545251587821 is a deficient number, since it is larger than the sum of its proper divisors (47526391824435).

82545251587821 is a wasteful number, since it uses less digits than its factorization.

82545251587821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165913 (or 2165910 counting only the distinct ones).

The product of its digits is 71680000, while the sum is 63.

The spelling of 82545251587821 in words is "eighty-two trillion, five hundred forty-five billion, two hundred fifty-one million, five hundred eighty-seven thousand, eight hundred twenty-one".