67447640993 has 2 divisors, whose sum is σ = 67447640994. Its totient is φ = 67447640992.

The previous prime is 67447640989. The next prime is 67447641043. The reversal of 67447640993 is 39904674476.

67447640993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41232145249 + 26215495744 = 203057^2 + 161912^2 .

It is a cyclic number.

It is not a de Polignac number, because 67447640993 - 2² = 67447640989 is a prime.

It is a super-2 number, since 2×67447640993² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67447640963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33723820496 + 33723820497.

It is an arithmetic number, because the mean of its divisors is an integer number (33723820497).

Almost surely, 2^67447640993 is an apocalyptic number.

It is an amenable number.

67447640993 is a deficient number, since it is larger than the sum of its proper divisors (1).

67447640993 is an equidigital number, since it uses as much as digits as its factorization.

67447640993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27433728, while the sum is 59.

The spelling of 67447640993 in words is "sixty-seven billion, four hundred forty-seven million, six hundred forty thousand, nine hundred ninety-three".