81267224026 has 4 divisors (see below), whose sum is σ = 121900836042. Its totient is φ = 40633612012.

The previous prime is 81267224011. The next prime is 81267224047. The reversal of 81267224026 is 62042276218.

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., 69802168401 + 11465055625 = 264201^2 + 107075^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81267224026.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20316806005 + ... + 20316806008.

Almost surely, 2^81267224026 is an apocalyptic number.

81267224026 is a deficient number, since it is larger than the sum of its proper divisors (40633612016).

81267224026 is a wasteful number, since it uses less digits than its factorization.

81267224026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40633612015.

The product of its (nonzero) digits is 129024, while the sum is 40.

The spelling of 81267224026 in words is "eighty-one billion, two hundred sixty-seven million, two hundred twenty-four thousand, twenty-six".