161772067 has 2 divisors, whose sum is σ = 161772068. Its totient is φ = 161772066.

The previous prime is 161772049. The next prime is 161772097. The reversal of 161772067 is 760277161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161772067 - 2¹¹ = 161770019 is a prime.

It is a super-2 number, since 2×161772067² = 52340403322904978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161772047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80886033 + 80886034.

It is an arithmetic number, because the mean of its divisors is an integer number (80886034).

Almost surely, 2^161772067 is an apocalyptic number.

161772067 is a deficient number, since it is larger than the sum of its proper divisors (1).

161772067 is an equidigital number, since it uses as much as digits as its factorization.

161772067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24696, while the sum is 37.

The square root of 161772067 is about 12718.9648556791. The cubic root of 161772067 is about 544.8803901024.

The spelling of 161772067 in words is "one hundred sixty-one million, seven hundred seventy-two thousand, sixty-seven".