667261426 has 8 divisors (see below), whose sum is σ = 1077883884. Its totient is φ = 307966800.

The previous prime is 667261423. The next prime is 667261459. The reversal of 667261426 is 624162766.

It can be written as a sum of positive squares in 2 ways, for example, as 663835225 + 3426201 = 25765^2 + 1851^2 .

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

It is not an unprimeable number, because it can be changed into a prime (667261421) 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, 12831925 + ... + 12831976.

Almost surely, 2^667261426 is an apocalyptic number.

667261426 is a deficient number, since it is larger than the sum of its proper divisors (410622458).

667261426 is a wasteful number, since it uses less digits than its factorization.

667261426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25663916.

The product of its digits is 145152, while the sum is 40.

The square root of 667261426 is about 25831.4038720314. The cubic root of 667261426 is about 873.8401725872.

The spelling of 667261426 in words is "six hundred sixty-seven million, two hundred sixty-one thousand, four hundred twenty-six".