71942590781 has 4 divisors (see below), whose sum is σ = 71953238364. Its totient is φ = 71931943200.

The previous prime is 71942590711. The next prime is 71942590823. The reversal of 71942590781 is 18709524917.

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 65707119556 + 6235471225 = 256334^2 + 78965^2 .

It is a cyclic number.

It is not a de Polignac number, because 71942590781 - 2³⁴ = 54762721597 is a prime.

It is a super-2 number, since 2×71942590781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71942590711) 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, 5313650 + ... + 5327171.

It is an arithmetic number, because the mean of its divisors is an integer number (17988309591).

Almost surely, 2^71942590781 is an apocalyptic number.

It is an amenable number.

71942590781 is a deficient number, since it is larger than the sum of its proper divisors (10647583).

71942590781 is a wasteful number, since it uses less digits than its factorization.

71942590781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10647582.

The product of its (nonzero) digits is 1270080, while the sum is 53.

The spelling of 71942590781 in words is "seventy-one billion, nine hundred forty-two million, five hundred ninety thousand, seven hundred eighty-one".