826942396781 has 16 divisors (see below), whose sum is σ = 848881047168. Its totient is φ = 805293988800.

The previous prime is 826942396757. The next prime is 826942396823. The reversal of 826942396781 is 187693249628.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-826942396781 is a prime.

It is a super-2 number, since 2×826942396781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (826942326781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32263151 + ... + 32288771.

It is an arithmetic number, because the mean of its divisors is an integer number (53055065448).

Almost surely, 2^826942396781 is an apocalyptic number.

It is an amenable number.

826942396781 is a deficient number, since it is larger than the sum of its proper divisors (21938650387).

826942396781 is a wasteful number, since it uses less digits than its factorization.

826942396781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31252.

The product of its digits is 62705664, while the sum is 65.

The spelling of 826942396781 in words is "eight hundred twenty-six billion, nine hundred forty-two million, three hundred ninety-six thousand, seven hundred eighty-one".