81826079274 has 12 divisors (see below), whose sum is σ = 177289838466. Its totient is φ = 27275359752.

The previous prime is 81826079267. The next prime is 81826079281. The reversal of 81826079274 is 47297062818.

It is a happy number.

81826079274 is a `hidden beast` number, since 8 + 1 + 8 + 2 + 607 + 9 + 27 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (81826079267) and next prime (81826079281).

It can be written as a sum of positive squares in only one way, i.e., 81171998649 + 654080625 = 284907^2 + 25575^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81826079274.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2272946629 + ... + 2272946664.

Almost surely, 2^81826079274 is an apocalyptic number.

81826079274 is an abundant number, since it is smaller than the sum of its proper divisors (95463759192).

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

81826079274 is a wasteful number, since it uses less digits than its factorization.

81826079274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4545893301 (or 4545893298 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 81826079274 in words is "eighty-one billion, eight hundred twenty-six million, seventy-nine thousand, two hundred seventy-four".