161937971417 has 2 divisors, whose sum is σ = 161937971418. Its totient is φ = 161937971416.

The previous prime is 161937971407. The next prime is 161937971473. The reversal of 161937971417 is 714179739161.

It is an a-pointer prime, because the next prime (161937971473) can be obtained adding 161937971417 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159000765001 + 2937206416 = 398749^2 + 54196^2 .

It is a cyclic number.

It is not a de Polignac number, because 161937971417 - 2⁴ = 161937971401 is a prime.

It is not a weakly prime, because it can be changed into another prime (161937971407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80968985708 + 80968985709.

It is an arithmetic number, because the mean of its divisors is an integer number (80968985709).

Almost surely, 2^161937971417 is an apocalyptic number.

It is an amenable number.

161937971417 is a deficient number, since it is larger than the sum of its proper divisors (1).

161937971417 is an equidigital number, since it uses as much as digits as its factorization.

161937971417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2000376, while the sum is 56.

The spelling of 161937971417 in words is "one hundred sixty-one billion, nine hundred thirty-seven million, nine hundred seventy-one thousand, four hundred seventeen".