667601597 has 4 divisors (see below), whose sum is σ = 718955580. Its totient is φ = 616247616.

The previous prime is 667601581. The next prime is 667601609. The reversal of 667601597 is 795106766.

It is a happy number.

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 255552196 + 412049401 = 15986^2 + 20299^2 .

It is a cyclic number.

It is not a de Polignac number, because 667601597 - 2⁴ = 667601581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667601527) 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, 25676972 + ... + 25676997.

It is an arithmetic number, because the mean of its divisors is an integer number (179738895).

Almost surely, 2^667601597 is an apocalyptic number.

It is an amenable number.

667601597 is a deficient number, since it is larger than the sum of its proper divisors (51353983).

667601597 is a wasteful number, since it uses less digits than its factorization.

667601597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51353982.

The product of its (nonzero) digits is 476280, while the sum is 47.

The square root of 667601597 is about 25837.9874796781. The cubic root of 667601597 is about 873.9886424244.

The spelling of 667601597 in words is "six hundred sixty-seven million, six hundred one thousand, five hundred ninety-seven".