667738241 has 4 divisors (see below), whose sum is σ = 668838912. Its totient is φ = 666637572.

The previous prime is 667738229. The next prime is 667738283. The reversal of 667738241 is 142837766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 142837766 = 2 ⋅71418883.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667738241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667738192 and 667738201.

It is not an unprimeable number, because it can be changed into a prime (667938241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 549425 + ... + 550638.

It is an arithmetic number, because the mean of its divisors is an integer number (167209728).

Almost surely, 2^667738241 is an apocalyptic number.

It is an amenable number.

667738241 is a deficient number, since it is larger than the sum of its proper divisors (1100671).

667738241 is a wasteful number, since it uses less digits than its factorization.

667738241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100670.

The product of its digits is 338688, while the sum is 44.

The square root of 667738241 is about 25840.6315905784. The cubic root of 667738241 is about 874.0482673852.

The spelling of 667738241 in words is "six hundred sixty-seven million, seven hundred thirty-eight thousand, two hundred forty-one".