30667861681 has 2 divisors, whose sum is σ = 30667861682. Its totient is φ = 30667861680.

The previous prime is 30667861673. The next prime is 30667861687. The reversal of 30667861681 is 18616876603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30584413456 + 83448225 = 174884^2 + 9135^2 .

It is a cyclic number.

It is not a de Polignac number, because 30667861681 - 2³ = 30667861673 is a prime.

It is a super-2 number, since 2×30667861681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (30667861687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15333930840 + 15333930841.

It is an arithmetic number, because the mean of its divisors is an integer number (15333930841).

Almost surely, 2^30667861681 is an apocalyptic number.

It is an amenable number.

30667861681 is a deficient number, since it is larger than the sum of its proper divisors (1).

30667861681 is an equidigital number, since it uses as much as digits as its factorization.

30667861681 is an evil number, because the sum of its binary digits is even.

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

The spelling of 30667861681 in words is "thirty billion, six hundred sixty-seven million, eight hundred sixty-one thousand, six hundred eighty-one".