55630400491 has 2 divisors, whose sum is σ = 55630400492. Its totient is φ = 55630400490.

The previous prime is 55630400473. The next prime is 55630400531. The reversal of 55630400491 is 19400403655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55630400491 - 2²⁵ = 55596846059 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55630400491.

It is not a weakly prime, because it can be changed into another prime (55630400471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27815200245 + 27815200246.

It is an arithmetic number, because the mean of its divisors is an integer number (27815200246).

Almost surely, 2^55630400491 is an apocalyptic number.

55630400491 is a deficient number, since it is larger than the sum of its proper divisors (1).

55630400491 is an equidigital number, since it uses as much as digits as its factorization.

55630400491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 55630400491 in words is "fifty-five billion, six hundred thirty million, four hundred thousand, four hundred ninety-one".