65557556503 has 2 divisors, whose sum is σ = 65557556504. Its totient is φ = 65557556502.

The previous prime is 65557556479. The next prime is 65557556507. The reversal of 65557556503 is 30565575556.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65557556503 - 2²¹ = 65555459351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65557556507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32778778251 + 32778778252.

It is an arithmetic number, because the mean of its divisors is an integer number (32778778252).

Almost surely, 2^65557556503 is an apocalyptic number.

65557556503 is a deficient number, since it is larger than the sum of its proper divisors (1).

65557556503 is an equidigital number, since it uses as much as digits as its factorization.

65557556503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11812500, while the sum is 52.

The spelling of 65557556503 in words is "sixty-five billion, five hundred fifty-seven million, five hundred fifty-six thousand, five hundred three".