667670801705 has 4 divisors (see below), whose sum is σ = 801204962052. Its totient is φ = 534136641360.

The previous prime is 667670801701. The next prime is 667670801723. The reversal of 667670801705 is 507108076766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 507108076766 = 2 ⋅253554038383.

It can be written as a sum of positive squares in 2 ways, for example, as 89786526736 + 577884274969 = 299644^2 + 760187^2 .

It is not a de Polignac number, because 667670801705 - 2² = 667670801701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667670801701) 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, 66767080166 + ... + 66767080175.

It is an arithmetic number, because the mean of its divisors is an integer number (200301240513).

Almost surely, 2^667670801705 is an apocalyptic number.

It is an amenable number.

667670801705 is a deficient number, since it is larger than the sum of its proper divisors (133534160347).

667670801705 is a wasteful number, since it uses less digits than its factorization.

667670801705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133534160346.

The product of its (nonzero) digits is 2963520, while the sum is 53.

The spelling of 667670801705 in words is "six hundred sixty-seven billion, six hundred seventy million, eight hundred one thousand, seven hundred five".