26161643 has 4 divisors (see below), whose sum is σ = 26172240. Its totient is φ = 26151048.

The previous prime is 26161633. The next prime is 26161661. The reversal of 26161643 is 34616162.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26161643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26161633) 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, 578 + ... + 7256.

It is an arithmetic number, because the mean of its divisors is an integer number (6543060).

Almost surely, 2^26161643 is an apocalyptic number.

26161643 is a deficient number, since it is larger than the sum of its proper divisors (10597).

26161643 is an equidigital number, since it uses as much as digits as its factorization.

26161643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10596.

The product of its digits is 5184, while the sum is 29.

The square root of 26161643 is about 5114.8453544560. The cubic root of 26161643 is about 296.8622706712.

The spelling of 26161643 in words is "twenty-six million, one hundred sixty-one thousand, six hundred forty-three".