30666761 has 4 divisors (see below), whose sum is σ = 30798612. Its totient is φ = 30534912.

The previous prime is 30666743. The next prime is 30666787. The reversal of 30666761 is 16766603.

It is a happy number.

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 19404025 + 11262736 = 4405^2 + 3356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30666761 is a prime.

It is a super-2 number, since 2×30666761² = 1880900460462242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30666791) 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, 65576 + ... + 66041.

It is an arithmetic number, because the mean of its divisors is an integer number (7699653).

Almost surely, 2^30666761 is an apocalyptic number.

It is an amenable number.

30666761 is a deficient number, since it is larger than the sum of its proper divisors (131851).

30666761 is a wasteful number, since it uses less digits than its factorization.

30666761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131850.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 30666761 is about 5537.7577592379. The cubic root of 30666761 is about 313.0083833798.

The spelling of 30666761 in words is "thirty million, six hundred sixty-six thousand, seven hundred sixty-one".