67928440091 has 2 divisors, whose sum is σ = 67928440092. Its totient is φ = 67928440090.

The previous prime is 67928440001. The next prime is 67928440163. The reversal of 67928440091 is 19004482976.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67928440091 is a prime.

It is a super-2 number, since 2×67928440091² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67928440001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33964220045 + 33964220046.

It is an arithmetic number, because the mean of its divisors is an integer number (33964220046).

Almost surely, 2^67928440091 is an apocalyptic number.

67928440091 is a deficient number, since it is larger than the sum of its proper divisors (1).

67928440091 is an equidigital number, since it uses as much as digits as its factorization.

67928440091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 67928440091 in words is "sixty-seven billion, nine hundred twenty-eight million, four hundred forty thousand, ninety-one".