67776361 has 2 divisors, whose sum is σ = 67776362. Its totient is φ = 67776360.

The previous prime is 67776349. The next prime is 67776367. The reversal of 67776361 is 16367776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44302336 + 23474025 = 6656^2 + 4845^2 .

It is a cyclic number.

It is not a de Polignac number, because 67776361 - 2⁹ = 67775849 is a prime.

It is a super-2 number, since 2×67776361² = 9187270220804642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67776367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33888180 + 33888181.

It is an arithmetic number, because the mean of its divisors is an integer number (33888181).

Almost surely, 2^67776361 is an apocalyptic number.

It is an amenable number.

67776361 is a deficient number, since it is larger than the sum of its proper divisors (1).

67776361 is an equidigital number, since it uses as much as digits as its factorization.

67776361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 222264, while the sum is 43.

The square root of 67776361 is about 8232.6399775528. The cubic root of 67776361 is about 407.7175593135.

The spelling of 67776361 in words is "sixty-seven million, seven hundred seventy-six thousand, three hundred sixty-one".