77218577430697 has 2 divisors, whose sum is σ = 77218577430698. Its totient is φ = 77218577430696.

The previous prime is 77218577430691. The next prime is 77218577430739. The reversal of 77218577430697 is 79603477581277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75842169805081 + 1376407625616 = 8708741^2 + 1173204^2 .

It is a cyclic number.

It is not a de Polignac number, because 77218577430697 - 2³ = 77218577430689 is a prime.

It is not a weakly prime, because it can be changed into another prime (77218577430691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38609288715348 + 38609288715349.

It is an arithmetic number, because the mean of its divisors is an integer number (38609288715349).

It is a 1-persistent number, because it is pandigital, but 2⋅77218577430697 = 154437154861394 is not.

Almost surely, 2^{77218577430697} is an apocalyptic number.

It is an amenable number.

77218577430697 is a deficient number, since it is larger than the sum of its proper divisors (1).

77218577430697 is an equidigital number, since it uses as much as digits as its factorization.

77218577430697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 871274880, while the sum is 73.

The spelling of 77218577430697 in words is "seventy-seven trillion, two hundred eighteen billion, five hundred seventy-seven million, four hundred thirty thousand, six hundred ninety-seven".