331666647 has 16 divisors (see below), whose sum is σ = 496946688. Its totient is φ = 195228000.

The previous prime is 331666627. The next prime is 331666663. The reversal of 331666647 is 746666133.

It is not a de Polignac number, because 331666647 - 2¹⁶ = 331601111 is a prime.

It is a super-2 number, since 2×331666647² = 220005529464445218, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 331666599 and 331666608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331666627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183979 + ... + 185772.

It is an arithmetic number, because the mean of its divisors is an integer number (31059168).

Almost surely, 2^331666647 is an apocalyptic number.

331666647 is a deficient number, since it is larger than the sum of its proper divisors (165280041).

331666647 is a wasteful number, since it uses less digits than its factorization.

331666647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369790.

The product of its digits is 326592, while the sum is 42.

The square root of 331666647 is about 18211.7172995849. The cubic root of 331666647 is about 692.2037271735.

The spelling of 331666647 in words is "three hundred thirty-one million, six hundred sixty-six thousand, six hundred forty-seven".