161566651151597 has 2 divisors, whose sum is σ = 161566651151598. Its totient is φ = 161566651151596.

The previous prime is 161566651151579. The next prime is 161566651151671. The reversal of 161566651151597 is 795151156665161.

It is a happy number.

Together with previous prime (161566651151579) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82987982331076 + 78578668820521 = 9109774^2 + 8864461^2 .

It is a cyclic number.

It is not a de Polignac number, because 161566651151597 - 2⁸ = 161566651151341 is a prime.

It is a super-2 number, since 2×161566651151597² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161566656151597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80783325575798 + 80783325575799.

It is an arithmetic number, because the mean of its divisors is an integer number (80783325575799).

Almost surely, 2^{161566651151597} is an apocalyptic number.

It is an amenable number.

161566651151597 is a deficient number, since it is larger than the sum of its proper divisors (1).

161566651151597 is an equidigital number, since it uses as much as digits as its factorization.

161566651151597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51030000, while the sum is 65.

The spelling of 161566651151597 in words is "one hundred sixty-one trillion, five hundred sixty-six billion, six hundred fifty-one million, one hundred fifty-one thousand, five hundred ninety-seven".