1665610515131 has 2 divisors, whose sum is σ = 1665610515132. Its totient is φ = 1665610515130.

The previous prime is 1665610515077. The next prime is 1665610515181. The reversal of 1665610515131 is 1315150165661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1665610515131 is a prime.

It is a super-2 number, since 2×1665610515131² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1665610515181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832805257565 + 832805257566.

It is an arithmetic number, because the mean of its divisors is an integer number (832805257566).

Almost surely, 2^{1665610515131} is an apocalyptic number.

1665610515131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665610515131 is an equidigital number, since it uses as much as digits as its factorization.

1665610515131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 41.

The spelling of 1665610515131 in words is "one trillion, six hundred sixty-five billion, six hundred ten million, five hundred fifteen thousand, one hundred thirty-one".