667918466197 has 4 divisors (see below), whose sum is σ = 707207787756. Its totient is φ = 628629144640.

The previous prime is 667918466179. The next prime is 667918466207. The reversal of 667918466197 is 791664819766.

667918466197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 286397295921 + 381521170276 = 535161^2 + 617674^2 .

It is a cyclic number.

It is not a de Polignac number, because 667918466197 - 2³¹ = 665770982549 is a prime.

It is a super-3 number, since 3×667918466197³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667918460197) 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, 19644660754 + ... + 19644660787.

It is an arithmetic number, because the mean of its divisors is an integer number (176801946939).

Almost surely, 2^667918466197 is an apocalyptic number.

It is an amenable number.

667918466197 is a deficient number, since it is larger than the sum of its proper divisors (39289321559).

667918466197 is a wasteful number, since it uses less digits than its factorization.

667918466197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39289321558.

The product of its digits is 164602368, while the sum is 70.

The spelling of 667918466197 in words is "six hundred sixty-seven billion, nine hundred eighteen million, four hundred sixty-six thousand, one hundred ninety-seven".