667401544 has 16 divisors (see below), whose sum is σ = 1259057520. Its totient is φ = 331652880.

The previous prime is 667401533. The next prime is 667401547. The reversal of 667401544 is 445104766.

It is not an unprimeable number, because it can be changed into a prime (667401547) 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 3 ways as a sum of consecutive naturals, for example, 254602 + ... + 257209.

It is an arithmetic number, because the mean of its divisors is an integer number (78691095).

Almost surely, 2^667401544 is an apocalyptic number.

It is an amenable number.

667401544 is a deficient number, since it is larger than the sum of its proper divisors (591655976).

667401544 is a wasteful number, since it uses less digits than its factorization.

667401544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511980 (or 511976 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 667401544 is about 25834.1158935234. The cubic root of 667401544 is about 873.9013341065.

The spelling of 667401544 in words is "six hundred sixty-seven million, four hundred one thousand, five hundred forty-four".