66871651 has 16 divisors (see below), whose sum is σ = 86250240. Its totient is φ = 50309280.

The previous prime is 66871639. The next prime is 66871667. The reversal of 66871651 is 15617866.

It is not a de Polignac number, because 66871651 - 2²¹ = 64774499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66871601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12741 + ... + 17206.

It is an arithmetic number, because the mean of its divisors is an integer number (5390640).

Almost surely, 2^66871651 is an apocalyptic number.

66871651 is a deficient number, since it is larger than the sum of its proper divisors (19378589).

66871651 is a wasteful number, since it uses less digits than its factorization.

66871651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29994.

The product of its digits is 60480, while the sum is 40.

The square root of 66871651 is about 8177.5088504996. The cubic root of 66871651 is about 405.8952931956.

It can be divided in two parts, 6687 and 1651, that added together give a palindrome (8338).

The spelling of 66871651 in words is "sixty-six million, eight hundred seventy-one thousand, six hundred fifty-one".