81170772863 has 8 divisors (see below), whose sum is σ = 81298265328. Its totient is φ = 81043357824.

The previous prime is 81170772853. The next prime is 81170772871. The reversal of 81170772863 is 36827707118.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81170772863 - 2⁴ = 81170772847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81170772853) 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 7 ways as a sum of consecutive naturals, for example, 2291495 + ... + 2326647.

It is an arithmetic number, because the mean of its divisors is an integer number (10162283166).

Almost surely, 2^81170772863 is an apocalyptic number.

81170772863 is a deficient number, since it is larger than the sum of its proper divisors (127492465).

81170772863 is a wasteful number, since it uses less digits than its factorization.

81170772863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38713.

The product of its (nonzero) digits is 790272, while the sum is 50.

The spelling of 81170772863 in words is "eighty-one billion, one hundred seventy million, seven hundred seventy-two thousand, eight hundred sixty-three".