47918881861 has 2 divisors, whose sum is σ = 47918881862. Its totient is φ = 47918881860.

The previous prime is 47918881853. The next prime is 47918881951. The reversal of 47918881861 is 16818881974.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32411160961 + 15507720900 = 180031^2 + 124530^2 .

It is a cyclic number.

It is not a de Polignac number, because 47918881861 - 2³ = 47918881853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 47918881861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47918881831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23959440930 + 23959440931.

It is an arithmetic number, because the mean of its divisors is an integer number (23959440931).

Almost surely, 2^47918881861 is an apocalyptic number.

It is an amenable number.

47918881861 is a deficient number, since it is larger than the sum of its proper divisors (1).

47918881861 is an equidigital number, since it uses as much as digits as its factorization.

47918881861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6193152, while the sum is 61.

The spelling of 47918881861 in words is "forty-seven billion, nine hundred eighteen million, eight hundred eighty-one thousand, eight hundred sixty-one".