161631667 has 2 divisors, whose sum is σ = 161631668. Its totient is φ = 161631666.

The previous prime is 161631653. The next prime is 161631677. The reversal of 161631667 is 766136161.

161631667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161631667 - 2¹¹ = 161629619 is a prime.

It is a super-2 number, since 2×161631667² = 52249591554397778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161631607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80815833 + 80815834.

It is an arithmetic number, because the mean of its divisors is an integer number (80815834).

Almost surely, 2^161631667 is an apocalyptic number.

161631667 is a deficient number, since it is larger than the sum of its proper divisors (1).

161631667 is an equidigital number, since it uses as much as digits as its factorization.

161631667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 161631667 is about 12713.4443405397. Note that the first 3 decimals coincide. The cubic root of 161631667 is about 544.7227128010.

The spelling of 161631667 in words is "one hundred sixty-one million, six hundred thirty-one thousand, six hundred sixty-seven".