161265011 has 4 divisors (see below), whose sum is σ = 161940000. Its totient is φ = 160590024.

The previous prime is 161264953. The next prime is 161265031. The reversal of 161265011 is 110562161.

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 161265011 - 2²⁶ = 94156147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161265031) 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, 337136 + ... + 337613.

It is an arithmetic number, because the mean of its divisors is an integer number (40485000).

Almost surely, 2^161265011 is an apocalyptic number.

161265011 is a deficient number, since it is larger than the sum of its proper divisors (674989).

161265011 is an equidigital number, since it uses as much as digits as its factorization.

161265011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674988.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 161265011 is about 12699.0161429931. The cubic root of 161265011 is about 544.3105059005.

The spelling of 161265011 in words is "one hundred sixty-one million, two hundred sixty-five thousand, eleven".