30186851861 has 2 divisors, whose sum is σ = 30186851862. Its totient is φ = 30186851860.

The previous prime is 30186851831. The next prime is 30186851917. The reversal of 30186851861 is 16815868103.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28772640625 + 1414211236 = 169625^2 + 37606^2 .

It is a cyclic number.

It is not a de Polignac number, because 30186851861 - 2¹⁴ = 30186835477 is a prime.

It is a super-2 number, since 2×30186851861² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30186851801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15093425930 + 15093425931.

It is an arithmetic number, because the mean of its divisors is an integer number (15093425931).

Almost surely, 2^30186851861 is an apocalyptic number.

It is an amenable number.

30186851861 is a deficient number, since it is larger than the sum of its proper divisors (1).

30186851861 is an equidigital number, since it uses as much as digits as its factorization.

30186851861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 47.

The spelling of 30186851861 in words is "thirty billion, one hundred eighty-six million, eight hundred fifty-one thousand, eight hundred sixty-one".