7861795549 has 2 divisors, whose sum is σ = 7861795550. Its totient is φ = 7861795548.

The previous prime is 7861795523. The next prime is 7861795559. The reversal of 7861795549 is 9455971687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4553820324 + 3307975225 = 67482^2 + 57515^2 .

It is an emirp because it is prime and its reverse (9455971687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7861795549 - 2⁹ = 7861795037 is a prime.

It is a super-2 number, since 2×7861795549² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7861795559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3930897774 + 3930897775.

It is an arithmetic number, because the mean of its divisors is an integer number (3930897775).

Almost surely, 2^7861795549 is an apocalyptic number.

It is an amenable number.

7861795549 is a deficient number, since it is larger than the sum of its proper divisors (1).

7861795549 is an equidigital number, since it uses as much as digits as its factorization.

7861795549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19051200, while the sum is 61.

The square root of 7861795549 is about 88666.7668802692. The cubic root of 7861795549 is about 1988.4159973958.

The spelling of 7861795549 in words is "seven billion, eight hundred sixty-one million, seven hundred ninety-five thousand, five hundred forty-nine".