55602566261591 has 2 divisors, whose sum is σ = 55602566261592. Its totient is φ = 55602566261590.

The previous prime is 55602566261491. The next prime is 55602566261617. The reversal of 55602566261591 is 19516266520655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55602566261591 - 2¹⁸ = 55602565999447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55602566261591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55602566261491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27801283130795 + 27801283130796.

It is an arithmetic number, because the mean of its divisors is an integer number (27801283130796).

Almost surely, 2^{55602566261591} is an apocalyptic number.

55602566261591 is a deficient number, since it is larger than the sum of its proper divisors (1).

55602566261591 is an equidigital number, since it uses as much as digits as its factorization.

55602566261591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160000, while the sum is 59.

The spelling of 55602566261591 in words is "fifty-five trillion, six hundred two billion, five hundred sixty-six million, two hundred sixty-one thousand, five hundred ninety-one".