81004408007 has 4 divisors (see below), whose sum is σ = 81029175696. Its totient is φ = 80979640320.

The previous prime is 81004407977. The next prime is 81004408019. The reversal of 81004408007 is 70080440018.

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

It is a cyclic number.

It is not a de Polignac number, because 81004408007 - 2⁸ = 81004407751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81004408027) 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, 12378938 + ... + 12385479.

It is an arithmetic number, because the mean of its divisors is an integer number (20257293924).

Almost surely, 2^81004408007 is an apocalyptic number.

81004408007 is a deficient number, since it is larger than the sum of its proper divisors (24767689).

81004408007 is a wasteful number, since it uses less digits than its factorization.

81004408007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24767688.

The product of its (nonzero) digits is 7168, while the sum is 32.

The spelling of 81004408007 in words is "eighty-one billion, four million, four hundred eight thousand, seven".