71698780369 has 4 divisors (see below), whose sum is σ = 71721043380. Its totient is φ = 71676517360.

The previous prime is 71698780357. The next prime is 71698780403. The reversal of 71698780369 is 96308789617.

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 31903318225 + 39795462144 = 178615^2 + 199488^2 .

It is a cyclic number.

It is not a de Polignac number, because 71698780369 - 2¹¹ = 71698778321 is a prime.

It is a super-2 number, since 2×71698780369² (a number of 23 digits) contains 22 as substring.

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 71698780369.

It is not an unprimeable number, because it can be changed into a prime (71698780469) 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, 11126674 + ... + 11133115.

It is an arithmetic number, because the mean of its divisors is an integer number (17930260845).

Almost surely, 2^71698780369 is an apocalyptic number.

It is an amenable number.

71698780369 is a deficient number, since it is larger than the sum of its proper divisors (22263011).

71698780369 is a wasteful number, since it uses less digits than its factorization.

71698780369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22263010.

The product of its (nonzero) digits is 27433728, while the sum is 64.

The spelling of 71698780369 in words is "seventy-one billion, six hundred ninety-eight million, seven hundred eighty thousand, three hundred sixty-nine".