7806481861 has 2 divisors, whose sum is σ = 7806481862. Its totient is φ = 7806481860.

The previous prime is 7806481853. The next prime is 7806481867. The reversal of 7806481861 is 1681846087.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7071800836 + 734681025 = 84094^2 + 27105^2 .

It is a cyclic number.

It is not a de Polignac number, because 7806481861 - 2³ = 7806481853 is a prime.

It is a super-2 number, since 2×7806481861² (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 (7806481867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3903240930 + 3903240931.

It is an arithmetic number, because the mean of its divisors is an integer number (3903240931).

Almost surely, 2^7806481861 is an apocalyptic number.

It is an amenable number.

7806481861 is a deficient number, since it is larger than the sum of its proper divisors (1).

7806481861 is an equidigital number, since it uses as much as digits as its factorization.

7806481861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 516096, while the sum is 49.

The square root of 7806481861 is about 88354.2973544581. The cubic root of 7806481861 is about 1983.7416800673.

The spelling of 7806481861 in words is "seven billion, eight hundred six million, four hundred eighty-one thousand, eight hundred sixty-one".