67766641 has 4 divisors (see below), whose sum is σ = 71752932. Its totient is φ = 63780352.

The previous prime is 67766627. The next prime is 67766663. The reversal of 67766641 is 14666776.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40768225 + 26998416 = 6385^2 + 5196^2 .

It is a cyclic number.

It is not a de Polignac number, because 67766641 - 2¹⁹ = 67242353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67767641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1993120 + ... + 1993153.

It is an arithmetic number, because the mean of its divisors is an integer number (17938233).

Almost surely, 2^67766641 is an apocalyptic number.

It is an amenable number.

67766641 is a deficient number, since it is larger than the sum of its proper divisors (3986291).

67766641 is a wasteful number, since it uses less digits than its factorization.

67766641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3986290.

The product of its digits is 254016, while the sum is 43.

The square root of 67766641 is about 8232.0496232712. The cubic root of 67766641 is about 407.6980677382.

The spelling of 67766641 in words is "sixty-seven million, seven hundred sixty-six thousand, six hundred forty-one".