43649012161 has 4 divisors (see below), whose sum is σ = 43649679024. Its totient is φ = 43648345300.

The previous prime is 43649012117. The next prime is 43649012191. The reversal of 43649012161 is 16121094634.

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 43649012161 - 2¹¹ = 43649010113 is a prime.

It is a super-2 number, since 2×43649012161² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43649012161.

It is not an unprimeable number, because it can be changed into a prime (43649012111) 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, 223075 + ... + 370216.

It is an arithmetic number, because the mean of its divisors is an integer number (10912419756).

Almost surely, 2^43649012161 is an apocalyptic number.

It is an amenable number.

43649012161 is a deficient number, since it is larger than the sum of its proper divisors (666863).

43649012161 is an equidigital number, since it uses as much as digits as its factorization.

43649012161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666862.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 43649012161 in words is "forty-three billion, six hundred forty-nine million, twelve thousand, one hundred sixty-one".