667376531266657 has 4 divisors (see below), whose sum is σ = 667455352171696. Its totient is φ = 667297710361620.

The previous prime is 667376531266573. The next prime is 667376531266663. The reversal of 667376531266657 is 756662135673766.

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 667376531266657 - 2¹¹ = 667376531264609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667376531266057) 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, 39410439819 + ... + 39410456752.

It is an arithmetic number, because the mean of its divisors is an integer number (166863838042924).

Almost surely, 2^{667376531266657} is an apocalyptic number.

It is an amenable number.

667376531266657 is a deficient number, since it is larger than the sum of its proper divisors (78820905039).

667376531266657 is an equidigital number, since it uses as much as digits as its factorization.

667376531266657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78820905038.

The product of its digits is 7201353600, while the sum is 76.

The spelling of 667376531266657 in words is "six hundred sixty-seven trillion, three hundred seventy-six billion, five hundred thirty-one million, two hundred sixty-six thousand, six hundred fifty-seven".