26625640021 has 2 divisors, whose sum is σ = 26625640022. Its totient is φ = 26625640020.

The previous prime is 26625639959. The next prime is 26625640031. The reversal of 26625640021 is 12004652662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18071424900 + 8554215121 = 134430^2 + 92489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26625640021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26625640031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13312820010 + 13312820011.

It is an arithmetic number, because the mean of its divisors is an integer number (13312820011).

Almost surely, 2^26625640021 is an apocalyptic number.

It is an amenable number.

26625640021 is a deficient number, since it is larger than the sum of its proper divisors (1).

26625640021 is an equidigital number, since it uses as much as digits as its factorization.

26625640021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 26625640021 in words is "twenty-six billion, six hundred twenty-five million, six hundred forty thousand, twenty-one".