66179861 has 12 divisors (see below), whose sum is σ = 77024556. Its totient is φ = 56622720.

The previous prime is 66179849. The next prime is 66179873. The reversal of 66179861 is 16897166.

It is an interprime number because it is at equal distance from previous prime (66179849) and next prime (66179873).

It can be written as a sum of positive squares in 2 ways, for example, as 39450961 + 26728900 = 6281^2 + 5170^2 .

It is not a de Polignac number, because 66179861 - 2⁶ = 66179797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66179161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14030 + ... + 18143.

It is an arithmetic number, because the mean of its divisors is an integer number (6418713).

Almost surely, 2^66179861 is an apocalyptic number.

It is an amenable number.

66179861 is a deficient number, since it is larger than the sum of its proper divisors (10844695).

66179861 is a wasteful number, since it uses less digits than its factorization.

66179861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32212 (or 32201 counting only the distinct ones).

The product of its digits is 108864, while the sum is 44.

The square root of 66179861 is about 8135.1005525439. The cubic root of 66179861 is about 404.4907708482.

The spelling of 66179861 in words is "sixty-six million, one hundred seventy-nine thousand, eight hundred sixty-one".