66167613 has 6 divisors (see below), whose sum is σ = 95575454. Its totient is φ = 44111736.

The previous prime is 66167567. The next prime is 66167617. The reversal of 66167613 is 31676166.

It can be written as a sum of positive squares in only one way, i.e., 60886809 + 5280804 = 7803^2 + 2298^2 .

It is not a de Polignac number, because 66167613 - 2¹⁰ = 66166589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66167617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3675970 + ... + 3675987.

Almost surely, 2^66167613 is an apocalyptic number.

It is an amenable number.

66167613 is a deficient number, since it is larger than the sum of its proper divisors (29407841).

66167613 is a wasteful number, since it uses less digits than its factorization.

66167613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7351963 (or 7351960 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 66167613 is about 8134.3477304576. The cubic root of 66167613 is about 404.4658160833.

The spelling of 66167613 in words is "sixty-six million, one hundred sixty-seven thousand, six hundred thirteen".