7861118977 has 2 divisors, whose sum is σ = 7861118978. Its totient is φ = 7861118976.

The previous prime is 7861118939. The next prime is 7861119037. The reversal of 7861118977 is 7798111687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7777652481 + 83466496 = 88191^2 + 9136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7861118977 is a prime.

It is not a weakly prime, because it can be changed into another prime (7861113977) 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, 3930559488 + 3930559489.

It is an arithmetic number, because the mean of its divisors is an integer number (3930559489).

Almost surely, 2^7861118977 is an apocalyptic number.

It is an amenable number.

7861118977 is a deficient number, since it is larger than the sum of its proper divisors (1).

7861118977 is an equidigital number, since it uses as much as digits as its factorization.

7861118977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1185408, while the sum is 55.

The square root of 7861118977 is about 88662.9515468552. The cubic root of 7861118977 is about 1988.3589559233.

The spelling of 7861118977 in words is "seven billion, eight hundred sixty-one million, one hundred eighteen thousand, nine hundred seventy-seven".