2609975706521 has 2 divisors, whose sum is σ = 2609975706522. Its totient is φ = 2609975706520.

The previous prime is 2609975706511. The next prime is 2609975706589. The reversal of 2609975706521 is 1256075799062.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1308690240400 + 1301285466121 = 1143980^2 + 1140739^2 .

It is a cyclic number.

It is not a de Polignac number, because 2609975706521 - 2²² = 2609971512217 is a prime.

It is a super-3 number, since 3×2609975706521³ (a number of 38 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2609975706511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1304987853260 + 1304987853261.

It is an arithmetic number, because the mean of its divisors is an integer number (1304987853261).

Almost surely, 2^{2609975706521} is an apocalyptic number.

It is an amenable number.

2609975706521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2609975706521 is an equidigital number, since it uses as much as digits as its factorization.

2609975706521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14288400, while the sum is 59.

The spelling of 2609975706521 in words is "two trillion, six hundred nine billion, nine hundred seventy-five million, seven hundred six thousand, five hundred twenty-one".