63645553 has 2 divisors, whose sum is σ = 63645554. Its totient is φ = 63645552.

The previous prime is 63645551. The next prime is 63645557. The reversal of 63645553 is 35554636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62283664 + 1361889 = 7892^2 + 1167^2 .

It is a cyclic number.

It is not a de Polignac number, because 63645553 - 2¹ = 63645551 is a prime.

Together with 63645551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (63645551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31822776 + 31822777.

It is an arithmetic number, because the mean of its divisors is an integer number (31822777).

Almost surely, 2^63645553 is an apocalyptic number.

It is an amenable number.

63645553 is a deficient number, since it is larger than the sum of its proper divisors (1).

63645553 is an equidigital number, since it uses as much as digits as its factorization.

63645553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162000, while the sum is 37.

The square root of 63645553 is about 7977.8163052304. The cubic root of 63645553 is about 399.2602013384.

The spelling of 63645553 in words is "sixty-three million, six hundred forty-five thousand, five hundred fifty-three".