1994764389511 has 2 divisors, whose sum is σ = 1994764389512. Its totient is φ = 1994764389510.

The previous prime is 1994764389503. The next prime is 1994764389539. The reversal of 1994764389511 is 1159834674991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1994764389511 - 2³ = 1994764389503 is a prime.

It is a super-2 number, since 2×1994764389511² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1994764389551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997382194755 + 997382194756.

It is an arithmetic number, because the mean of its divisors is an integer number (997382194756).

Almost surely, 2^{1994764389511} is an apocalyptic number.

1994764389511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994764389511 is an equidigital number, since it uses as much as digits as its factorization.

1994764389511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58786560, while the sum is 67.

The spelling of 1994764389511 in words is "one trillion, nine hundred ninety-four billion, seven hundred sixty-four million, three hundred eighty-nine thousand, five hundred eleven".