81007502405 has 8 divisors (see below), whose sum is σ = 97292023584. Its totient is φ = 64750654800.

The previous prime is 81007502369. The next prime is 81007502419. The reversal of 81007502405 is 50420570018.

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

It is not a de Polignac number, because 81007502405 - 2²² = 81003308101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6911951 + ... + 6923660.

It is an arithmetic number, because the mean of its divisors is an integer number (12161502948).

Almost surely, 2^81007502405 is an apocalyptic number.

It is an amenable number.

81007502405 is a deficient number, since it is larger than the sum of its proper divisors (16284521179).

81007502405 is a wasteful number, since it uses less digits than its factorization.

81007502405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13836787.

The product of its (nonzero) digits is 11200, while the sum is 32.

The spelling of 81007502405 in words is "eighty-one billion, seven million, five hundred two thousand, four hundred five".