1951956868487 has 2 divisors, whose sum is σ = 1951956868488. Its totient is φ = 1951956868486.

The previous prime is 1951956868483. The next prime is 1951956868523. The reversal of 1951956868487 is 7848686591591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1951956868487 - 2² = 1951956868483 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1951956868483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 975978434243 + 975978434244.

It is an arithmetic number, because the mean of its divisors is an integer number (975978434244).

Almost surely, 2^{1951956868487} is an apocalyptic number.

1951956868487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1951956868487 is an equidigital number, since it uses as much as digits as its factorization.

1951956868487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1045094400, while the sum is 77.

The spelling of 1951956868487 in words is "one trillion, nine hundred fifty-one billion, nine hundred fifty-six million, eight hundred sixty-eight thousand, four hundred eighty-seven".