63440021105707 has 4 divisors (see below), whose sum is σ = 63463578487200. Its totient is φ = 63416463724216.

The previous prime is 63440021105701. The next prime is 63440021105717. The reversal of 63440021105707 is 70750112004436.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63440021105707 is a prime.

It is a super-2 number, since 2×63440021105707² (a number of 28 digits) contains 22 as substring.

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 63440021105707.

It is not an unprimeable number, because it can be changed into a prime (63440021105701) 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, 11778686707 + ... + 11778692092.

It is an arithmetic number, because the mean of its divisors is an integer number (15865894621800).

Almost surely, 2^{63440021105707} is an apocalyptic number.

63440021105707 is a deficient number, since it is larger than the sum of its proper divisors (23557381493).

63440021105707 is a wasteful number, since it uses less digits than its factorization.

63440021105707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23557381492.

The product of its (nonzero) digits is 141120, while the sum is 40.

The spelling of 63440021105707 in words is "sixty-three trillion, four hundred forty billion, twenty-one million, one hundred five thousand, seven hundred seven".