2520566861 has 2 divisors, whose sum is σ = 2520566862. Its totient is φ = 2520566860.

The previous prime is 2520566857. The next prime is 2520566911. The reversal of 2520566861 is 1686650252.

2520566861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1690032100 + 830534761 = 41110^2 + 28819^2 .

It is a cyclic number.

It is not a de Polignac number, because 2520566861 - 2² = 2520566857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2520566801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260283430 + 1260283431.

It is an arithmetic number, because the mean of its divisors is an integer number (1260283431).

Almost surely, 2^2520566861 is an apocalyptic number.

It is an amenable number.

2520566861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2520566861 is an equidigital number, since it uses as much as digits as its factorization.

2520566861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 2520566861 is about 50205.2473452726. The cubic root of 2520566861 is about 1360.9204519022.

The spelling of 2520566861 in words is "two billion, five hundred twenty million, five hundred sixty-six thousand, eight hundred sixty-one".