161606111556587 has 2 divisors, whose sum is σ = 161606111556588. Its totient is φ = 161606111556586.

The previous prime is 161606111556511. The next prime is 161606111556623. The reversal of 161606111556587 is 785655111606161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161606111556587 - 2¹⁶ = 161606111491051 is a prime.

It is a super-2 number, since 2×161606111556587² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161606111556287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80803055778293 + 80803055778294.

It is an arithmetic number, because the mean of its divisors is an integer number (80803055778294).

Almost surely, 2^{161606111556587} is an apocalyptic number.

161606111556587 is a deficient number, since it is larger than the sum of its proper divisors (1).

161606111556587 is an equidigital number, since it uses as much as digits as its factorization.

161606111556587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072000, while the sum is 59.

The spelling of 161606111556587 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred eleven million, five hundred fifty-six thousand, five hundred eighty-seven".