81342456850 has 24 divisors (see below), whose sum is σ = 151328098980. Its totient is φ = 32530288320.

The previous prime is 81342456799. The next prime is 81342456889. The reversal of 81342456850 is 5865424318.

It can be written as a sum of positive squares in 6 ways, for example, as 17973960489 + 63368496361 = 134067^2 + 251731^2 .

It is a super-2 number, since 2×81342456850² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81342456850.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81756 + ... + 411544.

Almost surely, 2^81342456850 is an apocalyptic number.

81342456850 is a deficient number, since it is larger than the sum of its proper divisors (69985642130).

81342456850 is a wasteful number, since it uses less digits than its factorization.

81342456850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334734 (or 334729 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 46.

The spelling of 81342456850 in words is "eighty-one billion, three hundred forty-two million, four hundred fifty-six thousand, eight hundred fifty".