81247806453 has 32 divisors (see below), whose sum is σ = 121850353152. Its totient is φ = 47728699200.

The previous prime is 81247806443. The next prime is 81247806463. The reversal of 81247806453 is 35460874218.

It is an interprime number because it is at equal distance from previous prime (81247806443) and next prime (81247806463).

It is not a de Polignac number, because 81247806453 - 2⁵ = 81247806421 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81247806443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32650 + ... + 404427.

It is an arithmetic number, because the mean of its divisors is an integer number (3807823536).

Almost surely, 2^81247806453 is an apocalyptic number.

It is an amenable number.

81247806453 is a deficient number, since it is larger than the sum of its proper divisors (40602546699).

81247806453 is a wasteful number, since it uses less digits than its factorization.

81247806453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437265.

The product of its (nonzero) digits is 1290240, while the sum is 48.

The spelling of 81247806453 in words is "eighty-one billion, two hundred forty-seven million, eight hundred six thousand, four hundred fifty-three".