81365474607 has 8 divisors (see below), whose sum is σ = 108489150000. Its totient is φ = 54242724480.

The previous prime is 81365474573. The next prime is 81365474651. The reversal of 81365474607 is 70647456318.

It is a happy number.

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

It is not a de Polignac number, because 81365474607 - 2⁷ = 81365474479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81365474607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81365474207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9769 + ... + 403517.

It is an arithmetic number, because the mean of its divisors is an integer number (13561143750).

Almost surely, 2^81365474607 is an apocalyptic number.

81365474607 is a deficient number, since it is larger than the sum of its proper divisors (27123675393).

81365474607 is a wasteful number, since it uses less digits than its factorization.

81365474607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462633.

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 81365474607 in words is "eighty-one billion, three hundred sixty-five million, four hundred seventy-four thousand, six hundred seven".