63645953 has 24 divisors (see below), whose sum is σ = 78660000. Its totient is φ = 51202368.

The previous prime is 63645949. The next prime is 63645961. The reversal of 63645953 is 35954636.

It is not a de Polignac number, because 63645953 - 2² = 63645949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63645953.

It is not an unprimeable number, because it can be changed into a prime (63645973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127298 + ... + 127796.

It is an arithmetic number, because the mean of its divisors is an integer number (3277500).

Almost surely, 2^63645953 is an apocalyptic number.

It is an amenable number.

63645953 is a deficient number, since it is larger than the sum of its proper divisors (15014047).

63645953 is a wasteful number, since it uses less digits than its factorization.

63645953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 662 counting only the distinct ones).

The product of its digits is 291600, while the sum is 41.

The square root of 63645953 is about 7977.8413747078. The cubic root of 63645953 is about 399.2610377610.

The spelling of 63645953 in words is "sixty-three million, six hundred forty-five thousand, nine hundred fifty-three".