63640111 has 4 divisors (see below), whose sum is σ = 65360152. Its totient is φ = 61920072.

The previous prime is 63640079. The next prime is 63640127. The reversal of 63640111 is 11104636.

It is a happy number.

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 63640111 - 2⁵ = 63640079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63644111) 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, 859965 + ... + 860038.

It is an arithmetic number, because the mean of its divisors is an integer number (16340038).

Almost surely, 2^63640111 is an apocalyptic number.

63640111 is a deficient number, since it is larger than the sum of its proper divisors (1720041).

63640111 is a wasteful number, since it uses less digits than its factorization.

63640111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720040.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 63640111 is about 7977.4752271630. The cubic root of 63640111 is about 399.2488214601.

Adding to 63640111 its reverse (11104636), we get a palindrome (74744747).

The spelling of 63640111 in words is "sixty-three million, six hundred forty thousand, one hundred eleven".