81368221491498 has 8 divisors (see below), whose sum is σ = 162736442983008. Its totient is φ = 27122740497164.

The previous prime is 81368221491457. The next prime is 81368221491563. The reversal of 81368221491498 is 89419412286318.

It is a sphenic number, since it is the product of 3 distinct primes.

81368221491498 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6780685124286 + ... + 6780685124297.

It is an arithmetic number, because the mean of its divisors is an integer number (20342055372876).

Almost surely, 2^{81368221491498} is an apocalyptic number.

81368221491498 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81368221491498 is a wasteful number, since it uses less digits than its factorization.

81368221491498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13561370248588.

The product of its digits is 47775744, while the sum is 66.

The spelling of 81368221491498 in words is "eighty-one trillion, three hundred sixty-eight billion, two hundred twenty-one million, four hundred ninety-one thousand, four hundred ninety-eight".