63945155 has 4 divisors (see below), whose sum is σ = 76734192. Its totient is φ = 51156120.

The previous prime is 63945151. The next prime is 63945163. The reversal of 63945155 is 55154936.

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

It is not a de Polignac number, because 63945155 - 2² = 63945151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63945151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6394511 + ... + 6394520.

It is an arithmetic number, because the mean of its divisors is an integer number (19183548).

Almost surely, 2^63945155 is an apocalyptic number.

63945155 is a deficient number, since it is larger than the sum of its proper divisors (12789037).

63945155 is a wasteful number, since it uses less digits than its factorization.

63945155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12789036.

The product of its digits is 81000, while the sum is 38.

The square root of 63945155 is about 7996.5714528165. The cubic root of 63945155 is about 399.8857069292.

The spelling of 63945155 in words is "sixty-three million, nine hundred forty-five thousand, one hundred fifty-five".