820872525552 has 20 divisors (see below), whose sum is σ = 2120587357800. Its totient is φ = 273624175168.

The previous prime is 820872525491. The next prime is 820872525631. The reversal of 820872525552 is 255525278028.

It is a happy number.

It is a super-2 number, since 2×820872525552² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 820872525495 and 820872525504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8550755427 + ... + 8550755522.

It is an arithmetic number, because the mean of its divisors is an integer number (106029367890).

Almost surely, 2^820872525552 is an apocalyptic number.

It is an amenable number.

820872525552 is an abundant number, since it is smaller than the sum of its proper divisors (1299714832248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820872525552 is a wasteful number, since it uses less digits than its factorization.

820872525552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17101510960 (or 17101510954 counting only the distinct ones).

The product of its (nonzero) digits is 4480000, while the sum is 51.

The spelling of 820872525552 in words is "eight hundred twenty billion, eight hundred seventy-two million, five hundred twenty-five thousand, five hundred fifty-two".