26651404021201 has 4 divisors (see below), whose sum is σ = 26651533210992. Its totient is φ = 26651274831412.

The previous prime is 26651404021183. The next prime is 26651404021241. The reversal of 26651404021201 is 10212040415662.

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 26651404021201 - 2¹¹ = 26651404019153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26651404021241) 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, 64284955 + ... + 64698208.

It is an arithmetic number, because the mean of its divisors is an integer number (6662883302748).

Almost surely, 2^{26651404021201} is an apocalyptic number.

It is an amenable number.

26651404021201 is a deficient number, since it is larger than the sum of its proper divisors (129189791).

26651404021201 is a wasteful number, since it uses less digits than its factorization.

26651404021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129189790.

The product of its (nonzero) digits is 23040, while the sum is 34.

Adding to 26651404021201 its reverse (10212040415662), we get a palindrome (36863444436863).

The spelling of 26651404021201 in words is "twenty-six trillion, six hundred fifty-one billion, four hundred four million, twenty-one thousand, two hundred one".