4991938818001 has 2 divisors, whose sum is σ = 4991938818002. Its totient is φ = 4991938818000.

The previous prime is 4991938817993. The next prime is 4991938818059. The reversal of 4991938818001 is 1008188391994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3780010850625 + 1211927967376 = 1944225^2 + 1100876^2 .

It is a cyclic number.

It is not a de Polignac number, because 4991938818001 - 2³ = 4991938817993 is a prime.

It is not a weakly prime, because it can be changed into another prime (4991938818101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495969409000 + 2495969409001.

It is an arithmetic number, because the mean of its divisors is an integer number (2495969409001).

Almost surely, 2^{4991938818001} is an apocalyptic number.

It is an amenable number.

4991938818001 is a deficient number, since it is larger than the sum of its proper divisors (1).

4991938818001 is an equidigital number, since it uses as much as digits as its factorization.

4991938818001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 61.

The spelling of 4991938818001 in words is "four trillion, nine hundred ninety-one billion, nine hundred thirty-eight million, eight hundred eighteen thousand, one".