77220653 has 2 divisors, whose sum is σ = 77220654. Its totient is φ = 77220652.

The previous prime is 77220643. The next prime is 77220667. The reversal of 77220653 is 35602277.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57123364 + 20097289 = 7558^2 + 4483^2 .

It is an emirp because it is prime and its reverse (35602277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77220653 - 2⁸ = 77220397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77220623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38610326 + 38610327.

It is an arithmetic number, because the mean of its divisors is an integer number (38610327).

Almost surely, 2^77220653 is an apocalyptic number.

It is an amenable number.

77220653 is a deficient number, since it is larger than the sum of its proper divisors (1).

77220653 is an equidigital number, since it uses as much as digits as its factorization.

77220653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 32.

The square root of 77220653 is about 8787.5282645349. The cubic root of 77220653 is about 425.8380749988.

The spelling of 77220653 in words is "seventy-seven million, two hundred twenty thousand, six hundred fifty-three".