2520605561 has 2 divisors, whose sum is σ = 2520605562. Its totient is φ = 2520605560.

The previous prime is 2520605497. The next prime is 2520605599. The reversal of 2520605561 is 1655060252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2151197161 + 369408400 = 46381^2 + 19220^2 .

It is a cyclic number.

It is not a de Polignac number, because 2520605561 - 2⁶ = 2520605497 is a prime.

It is a super-3 number, since 3×2520605561³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2520605761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260302780 + 1260302781.

It is an arithmetic number, because the mean of its divisors is an integer number (1260302781).

Almost surely, 2^2520605561 is an apocalyptic number.

It is an amenable number.

2520605561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2520605561 is an equidigital number, since it uses as much as digits as its factorization.

2520605561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 2520605561 is about 50205.6327616733. The cubic root of 2520605561 is about 1360.9274169164.

The spelling of 2520605561 in words is "two billion, five hundred twenty million, six hundred five thousand, five hundred sixty-one".