667516641 has 16 divisors (see below), whose sum is σ = 971489280. Its totient is φ = 404323920.

The previous prime is 667516639. The next prime is 667516669. The reversal of 667516641 is 146615766.

It is a happy number.

It is not a de Polignac number, because 667516641 - 2¹ = 667516639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 667516593 and 667516602.

It is not an unprimeable number, because it can be changed into a prime (667516841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66000 + ... + 75438.

It is an arithmetic number, because the mean of its divisors is an integer number (60718080).

Almost surely, 2^667516641 is an apocalyptic number.

It is an amenable number.

667516641 is a deficient number, since it is larger than the sum of its proper divisors (303972639).

667516641 is a wasteful number, since it uses less digits than its factorization.

667516641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11596.

The product of its digits is 181440, while the sum is 42.

The square root of 667516641 is about 25836.3434138812. The cubic root of 667516641 is about 873.9515675536.

The spelling of 667516641 in words is "six hundred sixty-seven million, five hundred sixteen thousand, six hundred forty-one".