161766667 has 4 divisors (see below), whose sum is σ = 163584360. Its totient is φ = 159948976.

The previous prime is 161766637. The next prime is 161766673. The reversal of 161766667 is 766667161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161766667 - 2²³ = 153378059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161766637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 908713 + ... + 908890.

It is an arithmetic number, because the mean of its divisors is an integer number (40896090).

Almost surely, 2^161766667 is an apocalyptic number.

161766667 is a deficient number, since it is larger than the sum of its proper divisors (1817693).

161766667 is an equidigital number, since it uses as much as digits as its factorization.

161766667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1817692.

The product of its digits is 381024, while the sum is 46.

The square root of 161766667 is about 12718.7525724813. The cubic root of 161766667 is about 544.8743272782.

The spelling of 161766667 in words is "one hundred sixty-one million, seven hundred sixty-six thousand, six hundred sixty-seven".