30666681187 has 4 divisors (see below), whose sum is σ = 30704495416. Its totient is φ = 30628866960.

The previous prime is 30666681151. The next prime is 30666681217. The reversal of 30666681187 is 78118666603.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78118666603 = 89 ⋅877737827.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30666681187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30666682187) 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, 18905898 + ... + 18907519.

It is an arithmetic number, because the mean of its divisors is an integer number (7676123854).

Almost surely, 2^30666681187 is an apocalyptic number.

30666681187 is a deficient number, since it is larger than the sum of its proper divisors (37814229).

30666681187 is an equidigital number, since it uses as much as digits as its factorization.

30666681187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37814228.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 30666681187 in words is "thirty billion, six hundred sixty-six million, six hundred eighty-one thousand, one hundred eighty-seven".