81064759107 has 4 divisors (see below), whose sum is σ = 108086345480. Its totient is φ = 54043172736.

The previous prime is 81064759103. The next prime is 81064759117. The reversal of 81064759107 is 70195746018.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81064759107 - 2² = 81064759103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81064759103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13510793182 + ... + 13510793187.

It is an arithmetic number, because the mean of its divisors is an integer number (27021586370).

Almost surely, 2^81064759107 is an apocalyptic number.

81064759107 is a deficient number, since it is larger than the sum of its proper divisors (27021586373).

81064759107 is a wasteful number, since it uses less digits than its factorization.

81064759107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27021586372.

The product of its (nonzero) digits is 423360, while the sum is 48.

The spelling of 81064759107 in words is "eighty-one billion, sixty-four million, seven hundred fifty-nine thousand, one hundred seven".