667231420757 has 4 divisors (see below), whose sum is σ = 727888822656. Its totient is φ = 606574018860.

The previous prime is 667231420753. The next prime is 667231420769. The reversal of 667231420757 is 757024132766.

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 a cyclic number.

It is not a de Polignac number, because 667231420757 - 2² = 667231420753 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667231420753) 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, 30328700933 + ... + 30328700954.

It is an arithmetic number, because the mean of its divisors is an integer number (181972205664).

Almost surely, 2^667231420757 is an apocalyptic number.

It is an amenable number.

667231420757 is a deficient number, since it is larger than the sum of its proper divisors (60657401899).

667231420757 is a wasteful number, since it uses less digits than its factorization.

667231420757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60657401898.

The product of its (nonzero) digits is 2963520, while the sum is 50.

The spelling of 667231420757 in words is "six hundred sixty-seven billion, two hundred thirty-one million, four hundred twenty thousand, seven hundred fifty-seven".