667451 has 4 divisors (see below), whose sum is σ = 702600. Its totient is φ = 632304.

The previous prime is 667441. The next prime is 667463. The reversal of 667451 is 154766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154766 = 2 ⋅77383.

It is a cyclic number.

It is not a de Polignac number, because 667451 - 2¹⁰ = 666427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667421) 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, 17546 + ... + 17583.

It is an arithmetic number, because the mean of its divisors is an integer number (175650).

2⁶⁶⁷⁴⁵¹ is an apocalyptic number.

667451 is a deficient number, since it is larger than the sum of its proper divisors (35149).

667451 is a wasteful number, since it uses less digits than its factorization.

667451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35148.

The product of its digits is 5040, while the sum is 29.

The square root of 667451 is about 816.9767438551. The cubic root of 667451 is about 87.3922919611.

The spelling of 667451 in words is "six hundred sixty-seven thousand, four hundred fifty-one".