667231405127 has 16 divisors (see below), whose sum is σ = 765316475712. Its totient is φ = 569839614720.

The previous prime is 667231405091. The next prime is 667231405147. The reversal of 667231405127 is 721504132766.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 667231405127 - 2⁸ = 667231404871 is a prime.

It is a super-2 number, since 2×667231405127² (a number of 24 digits) 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 (667231405147) 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 15 ways as a sum of consecutive naturals, for example, 4707677 + ... + 4847337.

It is an arithmetic number, because the mean of its divisors is an integer number (47832279732).

Almost surely, 2^667231405127 is an apocalyptic number.

667231405127 is a deficient number, since it is larger than the sum of its proper divisors (98085070585).

667231405127 is a wasteful number, since it uses less digits than its factorization.

667231405127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142138.

The product of its (nonzero) digits is 423360, while the sum is 44.

The spelling of 667231405127 in words is "six hundred sixty-seven billion, two hundred thirty-one million, four hundred five thousand, one hundred twenty-seven".