161206336251 has 12 divisors (see below), whose sum is σ = 233676404728. Its totient is φ = 107091133344.

The previous prime is 161206336199. The next prime is 161206336273. The reversal of 161206336251 is 152633602161.

161206336251 is a `hidden beast` number, since 1 + 6 + 1 + 20 + 6 + 3 + 3 + 625 + 1 = 666.

It is not a de Polignac number, because 161206336251 - 2¹⁷ = 161206205179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161206336051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31643770 + ... + 31648863.

Almost surely, 2^161206336251 is an apocalyptic number.

161206336251 is a deficient number, since it is larger than the sum of its proper divisors (72470068477).

161206336251 is a wasteful number, since it uses less digits than its factorization.

161206336251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63292922 (or 63292919 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The spelling of 161206336251 in words is "one hundred sixty-one billion, two hundred six million, three hundred thirty-six thousand, two hundred fifty-one".