81407480667 has 8 divisors (see below), whose sum is σ = 108780822096. Its totient is φ = 54152896512.

The previous prime is 81407480647. The next prime is 81407480717. The reversal of 81407480667 is 76608470418.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-81407480667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81407480647) 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 7 ways as a sum of consecutive naturals, for example, 29687718 + ... + 29690459.

It is an arithmetic number, because the mean of its divisors is an integer number (13597602762).

Almost surely, 2^81407480667 is an apocalyptic number.

81407480667 is a deficient number, since it is larger than the sum of its proper divisors (27373341429).

81407480667 is a wasteful number, since it uses less digits than its factorization.

81407480667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59378637.

The product of its (nonzero) digits is 1806336, while the sum is 51.

The spelling of 81407480667 in words is "eighty-one billion, four hundred seven million, four hundred eighty thousand, six hundred sixty-seven".