161166599 has 4 divisors (see below), whose sum is σ = 175818120. Its totient is φ = 146515080.

The previous prime is 161166571. The next prime is 161166631. The reversal of 161166599 is 995661161.

161166599 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 161166599 - 2¹⁶ = 161101063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161166539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7325744 + ... + 7325765.

It is an arithmetic number, because the mean of its divisors is an integer number (43954530).

Almost surely, 2^161166599 is an apocalyptic number.

161166599 is a deficient number, since it is larger than the sum of its proper divisors (14651521).

161166599 is a wasteful number, since it uses less digits than its factorization.

161166599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14651520.

The product of its digits is 87480, while the sum is 44.

The square root of 161166599 is about 12695.1407632999. The cubic root of 161166599 is about 544.1997615111.

The spelling of 161166599 in words is "one hundred sixty-one million, one hundred sixty-six thousand, five hundred ninety-nine".