667747975 has 6 divisors (see below), whose sum is σ = 828007520. Its totient is φ = 534198360.

The previous prime is 667747973. The next prime is 667747979. The reversal of 667747975 is 579747766.

667747975 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 667747975 - 2¹ = 667747973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667747973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13354935 + ... + 13354984.

Almost surely, 2^667747975 is an apocalyptic number.

667747975 is a deficient number, since it is larger than the sum of its proper divisors (160259545).

667747975 is a wasteful number, since it uses less digits than its factorization.

667747975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26709929 (or 26709924 counting only the distinct ones).

The product of its digits is 15558480, while the sum is 58.

The square root of 667747975 is about 25840.8199366816. The cubic root of 667747975 is about 874.0525145307.

The spelling of 667747975 in words is "six hundred sixty-seven million, seven hundred forty-seven thousand, nine hundred seventy-five".