71805900757 has 4 divisors (see below), whose sum is σ = 72354037536. Its totient is φ = 71257763980.

The previous prime is 71805900743. The next prime is 71805900773. The reversal of 71805900757 is 75700950817.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75700950817 = 59 ⋅1283066963.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71805900757 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71805900757.

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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274068193 + ... + 274068454.

It is an arithmetic number, because the mean of its divisors is an integer number (18088509384).

Almost surely, 2^71805900757 is an apocalyptic number.

It is an amenable number.

71805900757 is a deficient number, since it is larger than the sum of its proper divisors (548136779).

71805900757 is a wasteful number, since it uses less digits than its factorization.

71805900757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548136778.

The product of its (nonzero) digits is 617400, while the sum is 49.

The spelling of 71805900757 in words is "seventy-one billion, eight hundred five million, nine hundred thousand, seven hundred fifty-seven".