26645616551 has 2 divisors, whose sum is σ = 26645616552. Its totient is φ = 26645616550.

The previous prime is 26645616497. The next prime is 26645616593. The reversal of 26645616551 is 15561654662.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26645616551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26645616496 and 26645616505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26645616251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13322808275 + 13322808276.

It is an arithmetic number, because the mean of its divisors is an integer number (13322808276).

Almost surely, 2^26645616551 is an apocalyptic number.

26645616551 is a deficient number, since it is larger than the sum of its proper divisors (1).

26645616551 is an equidigital number, since it uses as much as digits as its factorization.

26645616551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296000, while the sum is 47.

The spelling of 26645616551 in words is "twenty-six billion, six hundred forty-five million, six hundred sixteen thousand, five hundred fifty-one".