331666607 has 4 divisors (see below), whose sum is σ = 331703640. Its totient is φ = 331629576.

The previous prime is 331666597. The next prime is 331666609. The reversal of 331666607 is 706666133.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 706666133 = 331 ⋅2134943.

It is a cyclic number.

It is not a de Polignac number, because 331666607 - 2⁸ = 331666351 is a prime.

It is a super-2 number, since 2×331666607² = 220005476397784898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331666609) 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, 4244 + ... + 26102.

It is an arithmetic number, because the mean of its divisors is an integer number (82925910).

Almost surely, 2^331666607 is an apocalyptic number.

331666607 is a deficient number, since it is larger than the sum of its proper divisors (37033).

331666607 is a wasteful number, since it uses less digits than its factorization.

331666607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37032.

The product of its (nonzero) digits is 81648, while the sum is 38.

The square root of 331666607 is about 18211.7162013908. The cubic root of 331666607 is about 692.2036993462.

The spelling of 331666607 in words is "three hundred thirty-one million, six hundred sixty-six thousand, six hundred seven".