71666654413 has 4 divisors (see below), whose sum is σ = 71668087200. Its totient is φ = 71665221628.

The previous prime is 71666654399. The next prime is 71666654471. The reversal of 71666654413 is 31445666617.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71666654413 is a prime.

It is a super-2 number, since 2×71666654413² (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 (71666654473) 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, 638545 + ... + 742342.

It is an arithmetic number, because the mean of its divisors is an integer number (17917021800).

Almost surely, 2^71666654413 is an apocalyptic number.

It is an amenable number.

71666654413 is a deficient number, since it is larger than the sum of its proper divisors (1432787).

71666654413 is a wasteful number, since it uses less digits than its factorization.

71666654413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432786.

The product of its digits is 2177280, while the sum is 49.

The spelling of 71666654413 in words is "seventy-one billion, six hundred sixty-six million, six hundred fifty-four thousand, four hundred thirteen".