667238724605 has 4 divisors (see below), whose sum is σ = 800686469532. Its totient is φ = 533790979680.

The previous prime is 667238724589. The next prime is 667238724619. The reversal of 667238724605 is 506427832766.

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 93612745444 + 573625979161 = 305962^2 + 757381^2 .

It is not a de Polignac number, because 667238724605 - 2⁴ = 667238724589 is a prime.

It is a super-2 number, since 2×667238724605² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66723872456 + ... + 66723872465.

It is an arithmetic number, because the mean of its divisors is an integer number (200171617383).

Almost surely, 2^667238724605 is an apocalyptic number.

It is an amenable number.

667238724605 is a deficient number, since it is larger than the sum of its proper divisors (133447744927).

667238724605 is a wasteful number, since it uses less digits than its factorization.

667238724605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133447744926.

The product of its (nonzero) digits is 20321280, while the sum is 56.

The spelling of 667238724605 in words is "six hundred sixty-seven billion, two hundred thirty-eight million, seven hundred twenty-four thousand, six hundred five".