331666405 has 16 divisors (see below), whose sum is σ = 455307264. Its totient is φ = 227203200.

The previous prime is 331666403. The next prime is 331666441. The reversal of 331666405 is 504666133.

It is not a de Polignac number, because 331666405 - 2¹ = 331666403 is a prime.

It is a super-2 number, since 2×331666405² = 220005208411248050, 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 (331666403) 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, 36169 + ... + 44401.

It is an arithmetic number, because the mean of its divisors is an integer number (28456704).

Almost surely, 2^331666405 is an apocalyptic number.

331666405 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

331666405 is a deficient number, since it is larger than the sum of its proper divisors (123640859).

331666405 is a wasteful number, since it uses less digits than its factorization.

331666405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9396.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 331666405 is about 18211.7106555095. The cubic root of 331666405 is about 692.2035588184.

The spelling of 331666405 in words is "three hundred thirty-one million, six hundred sixty-six thousand, four hundred five".