64777369 has 2 divisors, whose sum is σ = 64777370. Its totient is φ = 64777368.

The previous prime is 64777367. The next prime is 64777373. The reversal of 64777369 is 96377746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64192144 + 585225 = 8012^2 + 765^2 .

It is a cyclic number.

It is not a de Polignac number, because 64777369 - 2¹ = 64777367 is a prime.

It is a super-2 number, since 2×64777369² = 8392215069124322, which contains 22 as substring.

Together with 64777367, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64777367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32388684 + 32388685.

It is an arithmetic number, because the mean of its divisors is an integer number (32388685).

Almost surely, 2^64777369 is an apocalyptic number.

It is an amenable number.

64777369 is a deficient number, since it is larger than the sum of its proper divisors (1).

64777369 is an equidigital number, since it uses as much as digits as its factorization.

64777369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 49.

The square root of 64777369 is about 8048.4389169577. The cubic root of 64777369 is about 401.6130055397.

The spelling of 64777369 in words is "sixty-four million, seven hundred seventy-seven thousand, three hundred sixty-nine".