7777421854957 has 2 divisors, whose sum is σ = 7777421854958. Its totient is φ = 7777421854956.

The previous prime is 7777421854903. The next prime is 7777421854991. The reversal of 7777421854957 is 7594581247777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7758960111081 + 18461743876 = 2785491^2 + 135874^2 .

It is an emirp because it is prime and its reverse (7594581247777) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7777421854957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7777421854957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7777421854997) 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, 3888710927478 + 3888710927479.

It is an arithmetic number, because the mean of its divisors is an integer number (3888710927479).

Almost surely, 2^{7777421854957} is an apocalyptic number.

It is an amenable number.

7777421854957 is a deficient number, since it is larger than the sum of its proper divisors (1).

7777421854957 is an equidigital number, since it uses as much as digits as its factorization.

7777421854957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 968083200, while the sum is 73.

The spelling of 7777421854957 in words is "seven trillion, seven hundred seventy-seven billion, four hundred twenty-one million, eight hundred fifty-four thousand, nine hundred fifty-seven".