667772331 has 4 divisors (see below), whose sum is σ = 890363112. Its totient is φ = 445181552.

The previous prime is 667772321. The next prime is 667772353. The reversal of 667772331 is 133277766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 667772331 - 2¹⁵ = 667739563 is a prime.

It is a super-2 number, since 2×667772331² = 891839772098347122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667772311) 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, 111295386 + ... + 111295391.

It is an arithmetic number, because the mean of its divisors is an integer number (222590778).

Almost surely, 2^667772331 is an apocalyptic number.

667772331 is a deficient number, since it is larger than the sum of its proper divisors (222590781).

667772331 is a wasteful number, since it uses less digits than its factorization.

667772331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222590780.

The product of its digits is 222264, while the sum is 42.

The square root of 667772331 is about 25841.2912022600. The cubic root of 667772331 is about 874.0631413765.

The spelling of 667772331 in words is "six hundred sixty-seven million, seven hundred seventy-two thousand, three hundred thirty-one".