5660505001561 has 2 divisors, whose sum is σ = 5660505001562. Its totient is φ = 5660505001560.

The previous prime is 5660505001537. The next prime is 5660505001607. The reversal of 5660505001561 is 1651005050665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5100935175625 + 559569825936 = 2258525^2 + 748044^2 .

It is a cyclic number.

It is not a de Polignac number, because 5660505001561 - 2¹³ = 5660504993369 is a prime.

It is a super-2 number, since 2×5660505001561² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5660505007561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2830252500780 + 2830252500781.

It is an arithmetic number, because the mean of its divisors is an integer number (2830252500781).

Almost surely, 2^{5660505001561} is an apocalyptic number.

It is an amenable number.

5660505001561 is a deficient number, since it is larger than the sum of its proper divisors (1).

5660505001561 is an equidigital number, since it uses as much as digits as its factorization.

5660505001561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 5660505001561 in words is "five trillion, six hundred sixty billion, five hundred five million, one thousand, five hundred sixty-one".