26161661 has 2 divisors, whose sum is σ = 26161662. Its totient is φ = 26161660.

The previous prime is 26161633. The next prime is 26161669. The reversal of 26161661 is 16616162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15960025 + 10201636 = 3995^2 + 3194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26161661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26161669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13080830 + 13080831.

It is an arithmetic number, because the mean of its divisors is an integer number (13080831).

Almost surely, 2^26161661 is an apocalyptic number.

It is an amenable number.

26161661 is a deficient number, since it is larger than the sum of its proper divisors (1).

26161661 is an equidigital number, since it uses as much as digits as its factorization.

26161661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 26161661 is about 5114.8471140397. The cubic root of 26161661 is about 296.8623387546.

The spelling of 26161661 in words is "twenty-six million, one hundred sixty-one thousand, six hundred sixty-one".