331666045 has 4 divisors (see below), whose sum is σ = 397999260. Its totient is φ = 265332832.

The previous prime is 331666037. The next prime is 331666051. The reversal of 331666045 is 540666133.

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

It can be written as a sum of positive squares in 2 ways, for example, as 171845881 + 159820164 = 13109^2 + 12642^2 .

It is a cyclic number.

It is not a de Polignac number, because 331666045 - 2³ = 331666037 is a prime.

It is a super-2 number, since 2×331666045² = 220004730811884050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 331666045.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33166600 + ... + 33166609.

It is an arithmetic number, because the mean of its divisors is an integer number (99499815).

Almost surely, 2^331666045 is an apocalyptic number.

It is an amenable number.

331666045 is a deficient number, since it is larger than the sum of its proper divisors (66333215).

331666045 is an equidigital number, since it uses as much as digits as its factorization.

331666045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66333214.

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

The square root of 331666045 is about 18211.7007717566. The cubic root of 331666045 is about 692.2033083726.

The spelling of 331666045 in words is "three hundred thirty-one million, six hundred sixty-six thousand, forty-five".