667421075 has 12 divisors (see below), whose sum is σ = 871160760. Its totient is φ = 505834560.

The previous prime is 667421047. The next prime is 667421099. The reversal of 667421075 is 570124766.

It is not a de Polignac number, because 667421075 - 2¹⁶ = 667355539 is a prime.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 702074 + ... + 703023.

It is an arithmetic number, because the mean of its divisors is an integer number (72596730).

Almost surely, 2^667421075 is an apocalyptic number.

667421075 is a deficient number, since it is larger than the sum of its proper divisors (203739685).

667421075 is a wasteful number, since it uses less digits than its factorization.

667421075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405126 (or 1405121 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 667421075 is about 25834.4938986619. The cubic root of 667421075 is about 873.9098587100.

The spelling of 667421075 in words is "six hundred sixty-seven million, four hundred twenty-one thousand, seventy-five".