81262054226 has 4 divisors (see below), whose sum is σ = 121893081342. Its totient is φ = 40631027112.

The previous prime is 81262054183. The next prime is 81262054241. The reversal of 81262054226 is 62245026218.

It is a Cunningham number, because it is equal to 285065²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 81262054225 + 1 = 285065^2 + 1^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81262054226.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20315513555 + ... + 20315513558.

Almost surely, 2^81262054226 is an apocalyptic number.

81262054226 is a deficient number, since it is larger than the sum of its proper divisors (40631027116).

81262054226 is a wasteful number, since it uses less digits than its factorization.

81262054226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40631027115.

The product of its (nonzero) digits is 92160, while the sum is 38.

The spelling of 81262054226 in words is "eighty-one billion, two hundred sixty-two million, fifty-four thousand, two hundred twenty-six".