2646206261 has 2 divisors, whose sum is σ = 2646206262. Its totient is φ = 2646206260.

The previous prime is 2646206237. The next prime is 2646206263. The reversal of 2646206261 is 1626026462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2223122500 + 423083761 = 47150^2 + 20569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2646206261 is a prime.

Together with 2646206263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2646206263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1323103130 + 1323103131.

It is an arithmetic number, because the mean of its divisors is an integer number (1323103131).

Almost surely, 2^2646206261 is an apocalyptic number.

It is an amenable number.

2646206261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2646206261 is an equidigital number, since it uses as much as digits as its factorization.

2646206261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 2646206261 is about 51441.2894570111. The cubic root of 2646206261 is about 1383.1668259581.

The spelling of 2646206261 in words is "two billion, six hundred forty-six million, two hundred six thousand, two hundred sixty-one".