7155484979861 has 2 divisors, whose sum is σ = 7155484979862. Its totient is φ = 7155484979860.

The previous prime is 7155484979833. The next prime is 7155484979893. The reversal of 7155484979861 is 1689794845517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7008647338225 + 146837641636 = 2647385^2 + 383194^2 .

It is an emirp because it is prime and its reverse (1689794845517) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7155484979861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7155484979821) 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, 3577742489930 + 3577742489931.

It is an arithmetic number, because the mean of its divisors is an integer number (3577742489931).

Almost surely, 2^{7155484979861} is an apocalyptic number.

It is an amenable number.

7155484979861 is a deficient number, since it is larger than the sum of its proper divisors (1).

7155484979861 is an equidigital number, since it uses as much as digits as its factorization.

7155484979861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 609638400, while the sum is 74.

The spelling of 7155484979861 in words is "seven trillion, one hundred fifty-five billion, four hundred eighty-four million, nine hundred seventy-nine thousand, eight hundred sixty-one".