77953397209 has 2 divisors, whose sum is σ = 77953397210. Its totient is φ = 77953397208.

The previous prime is 77953397189. The next prime is 77953397251. The reversal of 77953397209 is 90279335977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77919139600 + 34257609 = 279140^2 + 5853^2 .

It is a cyclic number.

It is not a de Polignac number, because 77953397209 - 2²³ = 77945008601 is a prime.

It is not a weakly prime, because it can be changed into another prime (77953397279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38976698604 + 38976698605.

It is an arithmetic number, because the mean of its divisors is an integer number (38976698605).

Almost surely, 2^77953397209 is an apocalyptic number.

It is an amenable number.

77953397209 is a deficient number, since it is larger than the sum of its proper divisors (1).

77953397209 is an equidigital number, since it uses as much as digits as its factorization.

77953397209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22504230, while the sum is 61.

The spelling of 77953397209 in words is "seventy-seven billion, nine hundred fifty-three million, three hundred ninety-seven thousand, two hundred nine".