71668659 has 16 divisors (see below), whose sum is σ = 98550144. Its totient is φ = 46300800.

The previous prime is 71668643. The next prime is 71668711. The reversal of 71668659 is 95686617.

It is not a de Polignac number, because 71668659 - 2⁴ = 71668643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71668859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14779 + ... + 19019.

It is an arithmetic number, because the mean of its divisors is an integer number (6159384).

Almost surely, 2^71668659 is an apocalyptic number.

71668659 is a deficient number, since it is larger than the sum of its proper divisors (26881485).

71668659 is a wasteful number, since it uses less digits than its factorization.

71668659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4418.

The product of its digits is 544320, while the sum is 48.

The square root of 71668659 is about 8465.7344040550. The cubic root of 71668659 is about 415.3776192264.

It can be divided in two parts, 71668 and 659, that added together give a palindrome (72327).

The spelling of 71668659 in words is "seventy-one million, six hundred sixty-eight thousand, six hundred fifty-nine".