63661202505 has 32 divisors (see below), whose sum is σ = 114769509120. Its totient is φ = 33474430080.

The previous prime is 63661202503. The next prime is 63661202519. The reversal of 63661202505 is 50520216636.

It is a happy number.

63661202505 is a `hidden beast` number, since 6 + 36 + 612 + 0 + 2 + 5 + 0 + 5 = 666.

It is not a de Polignac number, because 63661202505 - 2¹ = 63661202503 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63661202505.

It is not an unprimeable number, because it can be changed into a prime (63661202503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3311292 + ... + 3330461.

It is an arithmetic number, because the mean of its divisors is an integer number (3586547160).

Almost surely, 2^63661202505 is an apocalyptic number.

It is an amenable number.

63661202505 is a deficient number, since it is larger than the sum of its proper divisors (51108306615).

63661202505 is a wasteful number, since it uses less digits than its factorization.

63661202505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6641838 (or 6641832 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 63661202505 in words is "sixty-three billion, six hundred sixty-one million, two hundred two thousand, five hundred five".