71805923279 has 2 divisors, whose sum is σ = 71805923280. Its totient is φ = 71805923278.

The previous prime is 71805923227. The next prime is 71805923311. The reversal of 71805923279 is 97232950817.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71805923279 - 2⁸ = 71805923023 is a prime.

It is a super-2 number, since 2×71805923279² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71805923279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71805923179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35902961639 + 35902961640.

It is an arithmetic number, because the mean of its divisors is an integer number (35902961640).

Almost surely, 2^71805923279 is an apocalyptic number.

71805923279 is a deficient number, since it is larger than the sum of its proper divisors (1).

71805923279 is an equidigital number, since it uses as much as digits as its factorization.

71805923279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The spelling of 71805923279 in words is "seventy-one billion, eight hundred five million, nine hundred twenty-three thousand, two hundred seventy-nine".