66011407 has 16 divisors (see below), whose sum is σ = 84218112. Its totient is φ = 50238720.

The previous prime is 66011347. The next prime is 66011411. The reversal of 66011407 is 70411066.

It is a happy number.

It is not a de Polignac number, because 66011407 - 2¹⁵ = 65978639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66011467) 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, 6658 + ... + 13279.

It is an arithmetic number, because the mean of its divisors is an integer number (5263632).

Almost surely, 2^66011407 is an apocalyptic number.

66011407 is a deficient number, since it is larger than the sum of its proper divisors (18206705).

66011407 is a wasteful number, since it uses less digits than its factorization.

66011407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19998.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 66011407 is about 8124.7404266229. The cubic root of 66011407 is about 404.1472827538.

It can be divided in two parts, 6601 and 1407, that added together give a palindrome (8008).

The spelling of 66011407 in words is "sixty-six million, eleven thousand, four hundred seven".