67494961991 has 2 divisors, whose sum is σ = 67494961992. Its totient is φ = 67494961990.

The previous prime is 67494961973. The next prime is 67494962057. The reversal of 67494961991 is 19916949476.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67494961991 - 2²⁶ = 67427853127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67494961901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33747480995 + 33747480996.

It is an arithmetic number, because the mean of its divisors is an integer number (33747480996).

Almost surely, 2^67494961991 is an apocalyptic number.

67494961991 is a deficient number, since it is larger than the sum of its proper divisors (1).

67494961991 is an equidigital number, since it uses as much as digits as its factorization.

67494961991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26453952, while the sum is 65.

The spelling of 67494961991 in words is "sixty-seven billion, four hundred ninety-four million, nine hundred sixty-one thousand, nine hundred ninety-one".