26857661 has 2 divisors, whose sum is σ = 26857662. Its totient is φ = 26857660.

The previous prime is 26857657. The next prime is 26857679. The reversal of 26857661 is 16675862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21335161 + 5522500 = 4619^2 + 2350^2 .

It is a cyclic number.

It is not a de Polignac number, because 26857661 - 2² = 26857657 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26857631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13428830 + 13428831.

It is an arithmetic number, because the mean of its divisors is an integer number (13428831).

Almost surely, 2^26857661 is an apocalyptic number.

It is an amenable number.

26857661 is a deficient number, since it is larger than the sum of its proper divisors (1).

26857661 is an equidigital number, since it uses as much as digits as its factorization.

26857661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The square root of 26857661 is about 5182.4377468523. The cubic root of 26857661 is about 299.4718893947.

The spelling of 26857661 in words is "twenty-six million, eight hundred fifty-seven thousand, six hundred sixty-one".