667150561 has 24 divisors (see below), whose sum is σ = 842270912. Its totient is φ = 517255200.

The previous prime is 667150541. The next prime is 667150573. The reversal of 667150561 is 165051766.

It is not a de Polignac number, because 667150561 - 2⁷ = 667150433 is a prime.

It is a super-2 number, since 2×667150561² = 890179742085229442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 667150561.

It is not an unprimeable number, because it can be changed into a prime (667150541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 176851 + ... + 180583.

Almost surely, 2^667150561 is an apocalyptic number.

It is an amenable number.

667150561 is a deficient number, since it is larger than the sum of its proper divisors (175120351).

667150561 is a wasteful number, since it uses less digits than its factorization.

667150561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3973 (or 3962 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 667150561 is about 25829.2578484168. The cubic root of 667150561 is about 873.7917739372.

The spelling of 667150561 in words is "six hundred sixty-seven million, one hundred fifty thousand, five hundred sixty-one".