5615660081 has 2 divisors, whose sum is σ = 5615660082. Its totient is φ = 5615660080.

The previous prime is 5615660051. The next prime is 5615660087. The reversal of 5615660081 is 1800665165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4230331681 + 1385328400 = 65041^2 + 37220^2 .

It is a cyclic number.

It is not a de Polignac number, because 5615660081 - 2²² = 5611465777 is a prime.

It is a super-2 number, since 2×5615660081² = 63071276290673853122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5615660087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2807830040 + 2807830041.

It is an arithmetic number, because the mean of its divisors is an integer number (2807830041).

Almost surely, 2^5615660081 is an apocalyptic number.

It is an amenable number.

5615660081 is a deficient number, since it is larger than the sum of its proper divisors (1).

5615660081 is an equidigital number, since it uses as much as digits as its factorization.

5615660081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 5615660081 is about 74937.7080047155. The cubic root of 5615660081 is about 1777.4617781876.

The spelling of 5615660081 in words is "five billion, six hundred fifteen million, six hundred sixty thousand, eighty-one".