194821503911 has 2 divisors, whose sum is σ = 194821503912. Its totient is φ = 194821503910.

The previous prime is 194821503889. The next prime is 194821503937. The reversal of 194821503911 is 119305128491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 194821503911 - 2⁶ = 194821503847 is a prime.

It is a super-2 number, since 2×194821503911² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194821503941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97410751955 + 97410751956.

It is an arithmetic number, because the mean of its divisors is an integer number (97410751956).

Almost surely, 2^194821503911 is an apocalyptic number.

194821503911 is a deficient number, since it is larger than the sum of its proper divisors (1).

194821503911 is an equidigital number, since it uses as much as digits as its factorization.

194821503911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 44.

The spelling of 194821503911 in words is "one hundred ninety-four billion, eight hundred twenty-one million, five hundred three thousand, nine hundred eleven".