71923843069 has 4 divisors (see below), whose sum is σ = 77456446396. Its totient is φ = 66391239744.

The previous prime is 71923843021. The next prime is 71923843093. The reversal of 71923843069 is 96034832917.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96034832917 = 109 ⋅881053513.

It can be written as a sum of positive squares in 2 ways, for example, as 47630880025 + 24292963044 = 218245^2 + 155862^2 .

It is a cyclic number.

It is not a de Polignac number, because 71923843069 - 2¹⁷ = 71923711997 is a prime.

It is a super-2 number, since 2×71923843069² (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 (71923843169) 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, 2766301644 + ... + 2766301669.

It is an arithmetic number, because the mean of its divisors is an integer number (19364111599).

Almost surely, 2^71923843069 is an apocalyptic number.

It is an amenable number.

71923843069 is a deficient number, since it is larger than the sum of its proper divisors (5532603327).

71923843069 is a wasteful number, since it uses less digits than its factorization.

71923843069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5532603326.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The spelling of 71923843069 in words is "seventy-one billion, nine hundred twenty-three million, eight hundred forty-three thousand, sixty-nine".