667725431 has 4 divisors (see below), whose sum is σ = 668241552. Its totient is φ = 667209312.

The previous prime is 667725427. The next prime is 667725433. The reversal of 667725431 is 134527766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 667725431 - 2² = 667725427 is a prime.

It is a super-2 number, since 2×667725431² = 891714502408271522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667725433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256115 + ... + 258708.

It is an arithmetic number, because the mean of its divisors is an integer number (167060388).

Almost surely, 2^667725431 is an apocalyptic number.

667725431 is a deficient number, since it is larger than the sum of its proper divisors (516121).

667725431 is a wasteful number, since it uses less digits than its factorization.

667725431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516120.

The product of its digits is 211680, while the sum is 41.

The square root of 667725431 is about 25840.3837239310. The cubic root of 667725431 is about 874.0426780543.

The spelling of 667725431 in words is "six hundred sixty-seven million, seven hundred twenty-five thousand, four hundred thirty-one".