2661507617 has 2 divisors, whose sum is σ = 2661507618. Its totient is φ = 2661507616.

The previous prime is 2661507613. The next prime is 2661507637. The reversal of 2661507617 is 7167051662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2225574976 + 435932641 = 47176^2 + 20879^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661507617 - 2² = 2661507613 is a prime.

It is not a weakly prime, because it can be changed into another prime (2661507613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330753808 + 1330753809.

It is an arithmetic number, because the mean of its divisors is an integer number (1330753809).

Almost surely, 2^2661507617 is an apocalyptic number.

It is an amenable number.

2661507617 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661507617 is an equidigital number, since it uses as much as digits as its factorization.

2661507617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 2661507617 is about 51589.8014824636. The cubic root of 2661507617 is about 1385.8277000690.

The spelling of 2661507617 in words is "two billion, six hundred sixty-one million, five hundred seven thousand, six hundred seventeen".