667721347107077 has 32 divisors (see below), whose sum is σ = 712975615672320. Its totient is φ = 623872866291840.

The previous prime is 667721347106951. The next prime is 667721347107107. The reversal of 667721347107077 is 770701743127766.

It is a happy number.

667721347107077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-667721347107077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667721347107677) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2952198449 + ... + 2952424617.

It is an arithmetic number, because the mean of its divisors is an integer number (22280487989760).

Almost surely, 2^{667721347107077} is an apocalyptic number.

It is an amenable number.

667721347107077 is a deficient number, since it is larger than the sum of its proper divisors (45254268565243).

667721347107077 is a wasteful number, since it uses less digits than its factorization.

667721347107077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231593.

The product of its (nonzero) digits is 101648736, while the sum is 65.

The spelling of 667721347107077 in words is "six hundred sixty-seven trillion, seven hundred twenty-one billion, three hundred forty-seven million, one hundred seven thousand, seventy-seven".