71772427717 has 4 divisors (see below), whose sum is σ = 71799442956. Its totient is φ = 71745412480.

The previous prime is 71772427709. The next prime is 71772427733.

It is a happy number.

71772427717 is nontrivially palindromic in base 10.

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 48999806881 + 22772620836 = 221359^2 + 150906^2 .

It is a cyclic number.

It is not a de Polignac number, because 71772427717 - 2³ = 71772427709 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 (71772427117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13503634 + ... + 13508947.

It is an arithmetic number, because the mean of its divisors is an integer number (17949860739).

Almost surely, 2^71772427717 is an apocalyptic number.

It is an amenable number.

71772427717 is a deficient number, since it is larger than the sum of its proper divisors (27015239).

71772427717 is a wasteful number, since it uses less digits than its factorization.

71772427717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27015238.

The product of its digits is 1882384, while the sum is 52.

The spelling of 71772427717 in words is "seventy-one billion, seven hundred seventy-two million, four hundred twenty-seven thousand, seven hundred seventeen".