667601642 has 8 divisors (see below), whose sum is σ = 1003900932. Its totient is φ = 332968000.

The previous prime is 667601609. The next prime is 667601659. The reversal of 667601642 is 246106766.

It can be written as a sum of positive squares in 2 ways, for example, as 403246561 + 264355081 = 20081^2 + 16259^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 667601596 and 667601605.

It is an unprimeable number.

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, 415409 + ... + 417012.

Almost surely, 2^667601642 is an apocalyptic number.

667601642 is a deficient number, since it is larger than the sum of its proper divisors (336299290).

667601642 is a wasteful number, since it uses less digits than its factorization.

667601642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832824.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 667601642 is about 25837.9883504889. The cubic root of 667601642 is about 873.9886620616.

The spelling of 667601642 in words is "six hundred sixty-seven million, six hundred one thousand, six hundred forty-two".