67447927891 has 2 divisors, whose sum is σ = 67447927892. Its totient is φ = 67447927890.

The previous prime is 67447927867. The next prime is 67447927901. The reversal of 67447927891 is 19872974476.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67447927891 - 2²⁵ = 67414373459 is a prime.

It is not a weakly prime, because it can be changed into another prime (67447927691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33723963945 + 33723963946.

It is an arithmetic number, because the mean of its divisors is an integer number (33723963946).

Almost surely, 2^67447927891 is an apocalyptic number.

67447927891 is a deficient number, since it is larger than the sum of its proper divisors (1).

67447927891 is an equidigital number, since it uses as much as digits as its factorization.

67447927891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42674688, while the sum is 64.

The spelling of 67447927891 in words is "sixty-seven billion, four hundred forty-seven million, nine hundred twenty-seven thousand, eight hundred ninety-one".