2661972613 has 2 divisors, whose sum is σ = 2661972614. Its totient is φ = 2661972612.

The previous prime is 2661972589. The next prime is 2661972617. The reversal of 2661972613 is 3162791662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1535229124 + 1126743489 = 39182^2 + 33567^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661972613 - 2¹⁷ = 2661841541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2661972613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661972617) 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, 1330986306 + 1330986307.

It is an arithmetic number, because the mean of its divisors is an integer number (1330986307).

Almost surely, 2^2661972613 is an apocalyptic number.

It is an amenable number.

2661972613 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661972613 is an equidigital number, since it uses as much as digits as its factorization.

2661972613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 2661972613 is about 51594.3079515561. The cubic root of 2661972613 is about 1385.9084020502.

The spelling of 2661972613 in words is "two billion, six hundred sixty-one million, nine hundred seventy-two thousand, six hundred thirteen".