667726371145 has 8 divisors (see below), whose sum is σ = 801300992904. Its totient is φ = 534161531904.

The previous prime is 667726371131. The next prime is 667726371157. The reversal of 667726371145 is 541173627766.

It can be written as a sum of positive squares in 4 ways, for example, as 30002743369 + 637723627776 = 173213^2 + 798576^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667726371145 - 2⁷ = 667726371017 is a prime.

It is a super-2 number, since 2×667726371145² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2294614 + ... + 2569183.

It is an arithmetic number, because the mean of its divisors is an integer number (100162624113).

Almost surely, 2^667726371145 is an apocalyptic number.

It is an amenable number.

667726371145 is a deficient number, since it is larger than the sum of its proper divisors (133574621759).

667726371145 is a wasteful number, since it uses less digits than its factorization.

667726371145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4891259.

The product of its digits is 8890560, while the sum is 55.

The spelling of 667726371145 in words is "six hundred sixty-seven billion, seven hundred twenty-six million, three hundred seventy-one thousand, one hundred forty-five".