71322278977 has 4 divisors (see below), whose sum is σ = 71333448660. Its totient is φ = 71311109296.

The previous prime is 71322278899. The next prime is 71322279071. The reversal of 71322278977 is 77987222317.

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

It can be written as a sum of positive squares in 2 ways, for example, as 78127921 + 71244151056 = 8839^2 + 266916^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71322278977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71322078977) 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, 5575258 + ... + 5588035.

It is an arithmetic number, because the mean of its divisors is an integer number (17833362165).

Almost surely, 2^71322278977 is an apocalyptic number.

It is an amenable number.

71322278977 is a deficient number, since it is larger than the sum of its proper divisors (11169683).

71322278977 is a wasteful number, since it uses less digits than its factorization.

71322278977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11169682.

The product of its digits is 4148928, while the sum is 55.

The spelling of 71322278977 in words is "seventy-one billion, three hundred twenty-two million, two hundred seventy-eight thousand, nine hundred seventy-seven".