55561651603 has 2 divisors, whose sum is σ = 55561651604. Its totient is φ = 55561651602.

The previous prime is 55561651601. The next prime is 55561651627. The reversal of 55561651603 is 30615616555.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55561651603 - 2¹ = 55561651601 is a prime.

Together with 55561651601, 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 55561651603.

It is not a weakly prime, because it can be changed into another prime (55561651601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27780825801 + 27780825802.

It is an arithmetic number, because the mean of its divisors is an integer number (27780825802).

Almost surely, 2^55561651603 is an apocalyptic number.

55561651603 is a deficient number, since it is larger than the sum of its proper divisors (1).

55561651603 is an equidigital number, since it uses as much as digits as its factorization.

55561651603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 405000, while the sum is 43.

The spelling of 55561651603 in words is "fifty-five billion, five hundred sixty-one million, six hundred fifty-one thousand, six hundred three".