994721136640019 has 2 divisors, whose sum is σ = 994721136640020. Its totient is φ = 994721136640018.

The previous prime is 994721136639961. The next prime is 994721136640051. The reversal of 994721136640019 is 910046631127499.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 994721136640019 - 2⁴⁸ = 713246159929363 is a prime.

It is a super-2 number, since 2×994721136640019² (a number of 31 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (994721136640069) 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, 497360568320009 + 497360568320010.

It is an arithmetic number, because the mean of its divisors is an integer number (497360568320010).

Almost surely, 2^{994721136640019} is an apocalyptic number.

994721136640019 is a deficient number, since it is larger than the sum of its proper divisors (1).

994721136640019 is an equidigital number, since it uses as much as digits as its factorization.

994721136640019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17635968, while the sum is 62.

The spelling of 994721136640019 in words is "nine hundred ninety-four trillion, seven hundred twenty-one billion, one hundred thirty-six million, six hundred forty thousand, nineteen".