243277148161 has 4 divisors (see below), whose sum is σ = 243356472112. Its totient is φ = 243197824212.

The previous prime is 243277148131. The next prime is 243277148201. The reversal of 243277148161 is 161841772342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243277148161 - 2⁷ = 243277148033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243277148131) 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, 39657375 + ... + 39663508.

It is an arithmetic number, because the mean of its divisors is an integer number (60839118028).

Almost surely, 2^243277148161 is an apocalyptic number.

It is an amenable number.

243277148161 is a deficient number, since it is larger than the sum of its proper divisors (79323951).

243277148161 is an equidigital number, since it uses as much as digits as its factorization.

243277148161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79323950.

The product of its digits is 451584, while the sum is 46.

The spelling of 243277148161 in words is "two hundred forty-three billion, two hundred seventy-seven million, one hundred forty-eight thousand, one hundred sixty-one".