2612001661 has 2 divisors, whose sum is σ = 2612001662. Its totient is φ = 2612001660.

The previous prime is 2612001653. The next prime is 2612001677. The reversal of 2612001661 is 1661002162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1401379225 + 1210622436 = 37435^2 + 34794^2 .

It is a cyclic number.

It is not a de Polignac number, because 2612001661 - 2³ = 2612001653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2612001061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1306000830 + 1306000831.

It is an arithmetic number, because the mean of its divisors is an integer number (1306000831).

Almost surely, 2^2612001661 is an apocalyptic number.

It is an amenable number.

2612001661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2612001661 is an equidigital number, since it uses as much as digits as its factorization.

2612001661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 2612001661 is about 51107.7456067082. The cubic root of 2612001661 is about 1377.1814032791.

The spelling of 2612001661 in words is "two billion, six hundred twelve million, one thousand, six hundred sixty-one".