26621540551 has 2 divisors, whose sum is σ = 26621540552. Its totient is φ = 26621540550.

The previous prime is 26621540549. The next prime is 26621540651. The reversal of 26621540551 is 15504512662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26621540551 - 2¹ = 26621540549 is a prime.

Together with 26621540549, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 26621540551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26621540521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13310770275 + 13310770276.

It is an arithmetic number, because the mean of its divisors is an integer number (13310770276).

Almost surely, 2^26621540551 is an apocalyptic number.

26621540551 is a deficient number, since it is larger than the sum of its proper divisors (1).

26621540551 is an equidigital number, since it uses as much as digits as its factorization.

26621540551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 26621540551 in words is "twenty-six billion, six hundred twenty-one million, five hundred forty thousand, five hundred fifty-one".