667045123 has 4 divisors (see below), whose sum is σ = 667724688. Its totient is φ = 666365560.

The previous prime is 667045117. The next prime is 667045129. The reversal of 667045123 is 321540766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321540766 = 2 ⋅160770383.

It is an interprime number because it is at equal distance from previous prime (667045117) and next prime (667045129).

It is a cyclic number.

It is not a de Polignac number, because 667045123 - 2⁹ = 667044611 is a prime.

It is a super-2 number, since 2×667045123² = 889898392236170258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667045129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338308 + ... + 340273.

It is an arithmetic number, because the mean of its divisors is an integer number (166931172).

Almost surely, 2^667045123 is an apocalyptic number.

667045123 is a deficient number, since it is larger than the sum of its proper divisors (679565).

667045123 is an equidigital number, since it uses as much as digits as its factorization.

667045123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679564.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 667045123 is about 25827.2167102845. The cubic root of 667045123 is about 873.7457394954.

Adding to 667045123 its reverse (321540766), we get a palindrome (988585889).

The spelling of 667045123 in words is "six hundred sixty-seven million, forty-five thousand, one hundred twenty-three".