26631665 has 8 divisors (see below), whose sum is σ = 32034408. Its totient is φ = 21254400.

The previous prime is 26631659. The next prime is 26631713. The reversal of 26631665 is 56613662.

It can be written as a sum of positive squares in 4 ways, for example, as 16384 + 26615281 = 128^2 + 5159^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 26631665 - 2¹⁸ = 26369521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3986 + ... + 8315.

It is an arithmetic number, because the mean of its divisors is an integer number (4004301).

Almost surely, 2^26631665 is an apocalyptic number.

It is an amenable number.

26631665 is a deficient number, since it is larger than the sum of its proper divisors (5402743).

26631665 is a wasteful number, since it uses less digits than its factorization.

26631665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12739.

The product of its digits is 38880, while the sum is 35.

The square root of 26631665 is about 5160.5876603348. The cubic root of 26631665 is about 298.6295453428.

The spelling of 26631665 in words is "twenty-six million, six hundred thirty-one thousand, six hundred sixty-five".