667881291 has 32 divisors (see below), whose sum is σ = 1158524928. Its totient is φ = 331863840.

The previous prime is 667881287. The next prime is 667881299. The reversal of 667881291 is 192188766.

It is not a de Polignac number, because 667881291 - 2² = 667881287 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667881291.

It is not an unprimeable number, because it can be changed into a prime (667881299) 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, 57541 + ... + 68166.

It is an arithmetic number, because the mean of its divisors is an integer number (36203904).

Almost surely, 2^667881291 is an apocalyptic number.

667881291 is a deficient number, since it is larger than the sum of its proper divisors (490643637).

667881291 is a wasteful number, since it uses less digits than its factorization.

667881291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125751.

The product of its digits is 290304, while the sum is 48.

The square root of 667881291 is about 25843.3993700519. The cubic root of 667881291 is about 874.1106789058.

The spelling of 667881291 in words is "six hundred sixty-seven million, eight hundred eighty-one thousand, two hundred ninety-one".