81418569875 has 64 divisors (see below), whose sum is σ = 104971531392. Its totient is φ = 63026380800.

The previous prime is 81418569871. The next prime is 81418569907. The reversal of 81418569875 is 57896581418.

It is not a de Polignac number, because 81418569875 - 2² = 81418569871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81418569871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 146173097 + ... + 146173653.

It is an arithmetic number, because the mean of its divisors is an integer number (1640180178).

Almost surely, 2^81418569875 is an apocalyptic number.

81418569875 is a deficient number, since it is larger than the sum of its proper divisors (23552961517).

81418569875 is a wasteful number, since it uses less digits than its factorization.

81418569875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921 (or 911 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 62.

The spelling of 81418569875 in words is "eighty-one billion, four hundred eighteen million, five hundred sixty-nine thousand, eight hundred seventy-five".