63655247 has 4 divisors (see below), whose sum is σ = 65207856. Its totient is φ = 62102640.

The previous prime is 63655219. The next prime is 63655253. The reversal of 63655247 is 74255636.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63655247 - 2¹⁸ = 63393103 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63655247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63655297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776243 + ... + 776324.

It is an arithmetic number, because the mean of its divisors is an integer number (16301964).

Almost surely, 2^63655247 is an apocalyptic number.

63655247 is a deficient number, since it is larger than the sum of its proper divisors (1552609).

63655247 is a wasteful number, since it uses less digits than its factorization.

63655247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1552608.

The product of its digits is 151200, while the sum is 38.

The square root of 63655247 is about 7978.4238418374. The cubic root of 63655247 is about 399.2804710547.

The spelling of 63655247 in words is "sixty-three million, six hundred fifty-five thousand, two hundred forty-seven".