67687863491 has 2 divisors, whose sum is σ = 67687863492. Its totient is φ = 67687863490.

The previous prime is 67687863449. The next prime is 67687863497. The reversal of 67687863491 is 19436878676.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67687863491 - 2³⁴ = 50507994307 is a prime.

It is not a weakly prime, because it can be changed into another prime (67687863497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33843931745 + 33843931746.

It is an arithmetic number, because the mean of its divisors is an integer number (33843931746).

Almost surely, 2^67687863491 is an apocalyptic number.

67687863491 is a deficient number, since it is larger than the sum of its proper divisors (1).

67687863491 is an equidigital number, since it uses as much as digits as its factorization.

67687863491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73156608, while the sum is 65.

The spelling of 67687863491 in words is "sixty-seven billion, six hundred eighty-seven million, eight hundred sixty-three thousand, four hundred ninety-one".