7781407583377 has 2 divisors, whose sum is σ = 7781407583378. Its totient is φ = 7781407583376.

The previous prime is 7781407583333. The next prime is 7781407583387. The reversal of 7781407583377 is 7733857041877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5935284827536 + 1846122755841 = 2436244^2 + 1358721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7781407583377 is a prime.

It is not a weakly prime, because it can be changed into another prime (7781407583387) 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, 3890703791688 + 3890703791689.

It is an arithmetic number, because the mean of its divisors is an integer number (3890703791689).

Almost surely, 2^{7781407583377} is an apocalyptic number.

It is an amenable number.

7781407583377 is a deficient number, since it is larger than the sum of its proper divisors (1).

7781407583377 is an equidigital number, since it uses as much as digits as its factorization.

7781407583377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193616640, while the sum is 67.

The spelling of 7781407583377 in words is "seven trillion, seven hundred eighty-one billion, four hundred seven million, five hundred eighty-three thousand, three hundred seventy-seven".