66666272061 has 16 divisors (see below), whose sum is σ = 89061030144. Its totient is φ = 44357935104.

The previous prime is 66666272053. The next prime is 66666272063. The reversal of 66666272061 is 16027266666.

It is not a de Polignac number, because 66666272061 - 2³ = 66666272053 is a prime.

It is a super-2 number, since 2×66666272061² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66666272061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666272063) 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, 3369580 + ... + 3389306.

It is an arithmetic number, because the mean of its divisors is an integer number (5566314384).

Almost surely, 2^66666272061 is an apocalyptic number.

It is an amenable number.

66666272061 is a deficient number, since it is larger than the sum of its proper divisors (22394758083).

66666272061 is a wasteful number, since it uses less digits than its factorization.

66666272061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21860.

The product of its (nonzero) digits is 1306368, while the sum is 48.

The spelling of 66666272061 in words is "sixty-six billion, six hundred sixty-six million, two hundred seventy-two thousand, sixty-one".