71805900791 has 4 divisors (see below), whose sum is σ = 71810251632. Its totient is φ = 71801549952.

The previous prime is 71805900773. The next prime is 71805900797. The reversal of 71805900791 is 19700950817.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71805900791 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 (71805900797) 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, 2150570 + ... + 2183703.

It is an arithmetic number, because the mean of its divisors is an integer number (17952562908).

Almost surely, 2^71805900791 is an apocalyptic number.

71805900791 is a deficient number, since it is larger than the sum of its proper divisors (4350841).

71805900791 is a wasteful number, since it uses less digits than its factorization.

71805900791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4350840.

The product of its (nonzero) digits is 158760, while the sum is 47.

The spelling of 71805900791 in words is "seventy-one billion, eight hundred five million, nine hundred thousand, seven hundred ninety-one".