667971249 has 32 divisors (see below), whose sum is σ = 1003280256. Its totient is φ = 391749120.

The previous prime is 667971169. The next prime is 667971251. The reversal of 667971249 is 942179766.

It is not a de Polignac number, because 667971249 - 2¹³ = 667963057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667971299) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 239149 + ... + 241925.

It is an arithmetic number, because the mean of its divisors is an integer number (31352508).

Almost surely, 2^667971249 is an apocalyptic number.

It is an amenable number.

667971249 is a deficient number, since it is larger than the sum of its proper divisors (335309007).

667971249 is a wasteful number, since it uses less digits than its factorization.

667971249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3025.

The product of its digits is 1143072, while the sum is 51.

The square root of 667971249 is about 25845.1397558613. The cubic root of 667971249 is about 874.1499222661.

The spelling of 667971249 in words is "six hundred sixty-seven million, nine hundred seventy-one thousand, two hundred forty-nine".