161266438 has 4 divisors (see below), whose sum is σ = 241899660. Its totient is φ = 80633218.

The previous prime is 161266429. The next prime is 161266451. The reversal of 161266438 is 834662161.

It is a happy number.

161266438 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, and also an emirpimes, since its reverse is a distinct semiprime: 834662161 = 127 ⋅6572143.

It is a junction number, because it is equal to n+sod(n) for n = 161266397 and 161266406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40316608 + ... + 40316611.

It is an arithmetic number, because the mean of its divisors is an integer number (60474915).

Almost surely, 2^161266438 is an apocalyptic number.

161266438 is a deficient number, since it is larger than the sum of its proper divisors (80633222).

161266438 is an equidigital number, since it uses as much as digits as its factorization.

161266438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80633221.

The product of its digits is 41472, while the sum is 37.

The square root of 161266438 is about 12699.0723283238. The cubic root of 161266438 is about 544.3121113920.

The spelling of 161266438 in words is "one hundred sixty-one million, two hundred sixty-six thousand, four hundred thirty-eight".