820831040051 has 16 divisors (see below), whose sum is σ = 908902128768. Its totient is φ = 735003720000.

The previous prime is 820831040027. The next prime is 820831040063. The reversal of 820831040051 is 150040138028.

It is a de Polignac number, because none of the positive numbers 2^k-820831040051 is a prime.

It is a super-2 number, since 2×820831040051² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (820831070051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8851676 + ... + 8943926.

It is an arithmetic number, because the mean of its divisors is an integer number (56806383048).

Almost surely, 2^820831040051 is an apocalyptic number.

820831040051 is a deficient number, since it is larger than the sum of its proper divisors (88071088717).

820831040051 is a wasteful number, since it uses less digits than its factorization.

820831040051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104402.

The product of its (nonzero) digits is 7680, while the sum is 32.

Adding to 820831040051 its reverse (150040138028), we get a palindrome (970871178079).

The spelling of 820831040051 in words is "eight hundred twenty billion, eight hundred thirty-one million, forty thousand, fifty-one".