161464661 has 4 divisors (see below), whose sum is σ = 161491212. Its totient is φ = 161438112.

The previous prime is 161464649. The next prime is 161464687. The reversal of 161464661 is 166464161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166464161 = 1933 ⋅86117.

It can be written as a sum of positive squares in 2 ways, for example, as 38365636 + 123099025 = 6194^2 + 11095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161464661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161463661) 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, 875 + ... + 17991.

It is an arithmetic number, because the mean of its divisors is an integer number (40372803).

Almost surely, 2^161464661 is an apocalyptic number.

It is an amenable number.

161464661 is a deficient number, since it is larger than the sum of its proper divisors (26551).

161464661 is an equidigital number, since it uses as much as digits as its factorization.

161464661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26550.

The product of its digits is 20736, while the sum is 35.

The square root of 161464661 is about 12706.8745567114. The cubic root of 161464661 is about 544.5350364763.

The spelling of 161464661 in words is "one hundred sixty-one million, four hundred sixty-four thousand, six hundred sixty-one".