71866669331 has 4 divisors (see below), whose sum is σ = 74991307152. Its totient is φ = 68742031512.

The previous prime is 71866669307. The next prime is 71866669361. The reversal of 71866669331 is 13396666817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13396666817 = 67 ⋅199950251.

It is a cyclic number.

It is not a de Polignac number, because 71866669331 - 2²⁶ = 71799560467 is a prime.

It is a super-2 number, since 2×71866669331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71866669361) 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, 1562318876 + ... + 1562318921.

It is an arithmetic number, because the mean of its divisors is an integer number (18747826788).

Almost surely, 2^71866669331 is an apocalyptic number.

71866669331 is a deficient number, since it is larger than the sum of its proper divisors (3124637821).

71866669331 is a wasteful number, since it uses less digits than its factorization.

71866669331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3124637820.

The product of its digits is 5878656, while the sum is 56.

The spelling of 71866669331 in words is "seventy-one billion, eight hundred sixty-six million, six hundred sixty-nine thousand, three hundred thirty-one".