67776997 has 2 divisors, whose sum is σ = 67776998. Its totient is φ = 67776996.

The previous prime is 67776991. The next prime is 67777001. The reversal of 67776997 is 79967776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39325441 + 28451556 = 6271^2 + 5334^2 .

It is a cyclic number.

It is not a de Polignac number, because 67776997 - 2⁷ = 67776869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67776991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33888498 + 33888499.

It is an arithmetic number, because the mean of its divisors is an integer number (33888499).

Almost surely, 2^67776997 is an apocalyptic number.

It is an amenable number.

67776997 is a deficient number, since it is larger than the sum of its proper divisors (1).

67776997 is an equidigital number, since it uses as much as digits as its factorization.

67776997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7001316, while the sum is 58.

The square root of 67776997 is about 8232.6786041968. The cubic root of 67776997 is about 407.7188346232.

The spelling of 67776997 in words is "sixty-seven million, seven hundred seventy-six thousand, nine hundred ninety-seven".