667646673441 has 32 divisors (see below), whose sum is σ = 986224232448. Its totient is φ = 398349378240.

The previous prime is 667646673439. The next prime is 667646673443. The reversal of 667646673441 is 144376646766.

667646673441 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (667646673439) and next prime (667646673443).

It is not a de Polignac number, because 667646673441 - 2¹ = 667646673439 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (667646673443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3527176 + ... + 3711638.

It is an arithmetic number, because the mean of its divisors is an integer number (30819507264).

Almost surely, 2^667646673441 is an apocalyptic number.

It is an amenable number.

667646673441 is a deficient number, since it is larger than the sum of its proper divisors (318577559007).

667646673441 is a wasteful number, since it uses less digits than its factorization.

667646673441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186181.

The product of its digits is 73156608, while the sum is 60.

The spelling of 667646673441 in words is "six hundred sixty-seven billion, six hundred forty-six million, six hundred seventy-three thousand, four hundred forty-one".