667625457 has 4 divisors (see below), whose sum is σ = 890167280. Its totient is φ = 445083636.

The previous prime is 667625437. The next prime is 667625461. The reversal of 667625457 is 754526766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 667625457 - 2¹⁵ = 667592689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667625417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111270907 + ... + 111270912.

It is an arithmetic number, because the mean of its divisors is an integer number (222541820).

Almost surely, 2^667625457 is an apocalyptic number.

It is an amenable number.

667625457 is a deficient number, since it is larger than the sum of its proper divisors (222541823).

667625457 is a wasteful number, since it uses less digits than its factorization.

667625457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222541822.

The product of its digits is 2116800, while the sum is 48.

The square root of 667625457 is about 25838.4491988200. The cubic root of 667625457 is about 873.9990543830. Note that the first 3 decimals are identical.

The spelling of 667625457 in words is "six hundred sixty-seven million, six hundred twenty-five thousand, four hundred fifty-seven".