331666061 has 4 divisors (see below), whose sum is σ = 333384732. Its totient is φ = 329947392.

The previous prime is 331666051. The next prime is 331666067. The reversal of 331666061 is 160666133.

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 72777961 + 258888100 = 8531^2 + 16090^2 .

It is a cyclic number.

It is not a de Polignac number, because 331666061 - 2²² = 327471757 is a prime.

It is a super-2 number, since 2×331666061² = 220004752038511442, 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 (331666067) 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, 859046 + ... + 859431.

It is an arithmetic number, because the mean of its divisors is an integer number (83346183).

Almost surely, 2^331666061 is an apocalyptic number.

It is an amenable number.

331666061 is a deficient number, since it is larger than the sum of its proper divisors (1718671).

331666061 is a wasteful number, since it uses less digits than its factorization.

331666061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718670.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 331666061 is about 18211.7012110346. The cubic root of 331666061 is about 692.2033195035.

The spelling of 331666061 in words is "three hundred thirty-one million, six hundred sixty-six thousand, sixty-one".