1951956868523 has 2 divisors, whose sum is σ = 1951956868524. Its totient is φ = 1951956868522.

The previous prime is 1951956868487. The next prime is 1951956868571. The reversal of 1951956868523 is 3258686591591.

It is a weak prime.

It is an emirp because it is prime and its reverse (3258686591591) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1951956868523 is a prime.

It is not a weakly prime, because it can be changed into another prime (1951956868723) 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, 975978434261 + 975978434262.

It is an arithmetic number, because the mean of its divisors is an integer number (975978434262).

Almost surely, 2^{1951956868523} is an apocalyptic number.

1951956868523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1951956868523 is an equidigital number, since it uses as much as digits as its factorization.

1951956868523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968000, while the sum is 68.

The spelling of 1951956868523 in words is "one trillion, nine hundred fifty-one billion, nine hundred fifty-six million, eight hundred sixty-eight thousand, five hundred twenty-three".