667788741 has 6 divisors (see below), whose sum is σ = 964583750. Its totient is φ = 445192488.

The previous prime is 667788731. The next prime is 667788767. The reversal of 667788741 is 147887766.

It can be written as a sum of positive squares in only one way, i.e., 435348225 + 232440516 = 20865^2 + 15246^2 .

It is not a de Polignac number, because 667788741 - 2⁹ = 667788229 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 (667788731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37099366 + ... + 37099383.

Almost surely, 2^667788741 is an apocalyptic number.

It is an amenable number.

667788741 is a deficient number, since it is larger than the sum of its proper divisors (296795009).

667788741 is a wasteful number, since it uses less digits than its factorization.

667788741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74198755 (or 74198752 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 54.

The square root of 667788741 is about 25841.6087154031. The cubic root of 667788741 is about 874.0703011314.

The spelling of 667788741 in words is "six hundred sixty-seven million, seven hundred eighty-eight thousand, seven hundred forty-one".