161661015051667 has 2 divisors, whose sum is σ = 161661015051668. Its totient is φ = 161661015051666.

The previous prime is 161661015051541. The next prime is 161661015051677. The reversal of 161661015051667 is 766150510166161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161661015051667 is a prime.

It is a super-2 number, since 2×161661015051667² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161661015051677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80830507525833 + 80830507525834.

It is an arithmetic number, because the mean of its divisors is an integer number (80830507525834).

Almost surely, 2^{161661015051667} is an apocalyptic number.

161661015051667 is a deficient number, since it is larger than the sum of its proper divisors (1).

161661015051667 is an equidigital number, since it uses as much as digits as its factorization.

161661015051667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1360800, while the sum is 52.

The spelling of 161661015051667 in words is "one hundred sixty-one trillion, six hundred sixty-one billion, fifteen million, fifty-one thousand, six hundred sixty-seven".