81272762905 has 8 divisors (see below), whose sum is σ = 98295247872. Its totient is φ = 64506255408.

The previous prime is 81272762873. The next prime is 81272762933. The reversal of 81272762905 is 50926727218.

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 81272762905 - 2⁵ = 81272762873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63993667 + ... + 63994936.

It is an arithmetic number, because the mean of its divisors is an integer number (12286905984).

Almost surely, 2^81272762905 is an apocalyptic number.

It is an amenable number.

81272762905 is a deficient number, since it is larger than the sum of its proper divisors (17022484967).

81272762905 is a wasteful number, since it uses less digits than its factorization.

81272762905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127988735.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 81272762905 in words is "eighty-one billion, two hundred seventy-two million, seven hundred sixty-two thousand, nine hundred five".