63440370901 has 4 divisors (see below), whose sum is σ = 63640498572. Its totient is φ = 63240243232.

The previous prime is 63440370871. The next prime is 63440370907. The reversal of 63440370901 is 10907304436.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29066840100 + 34373530801 = 170490^2 + 185401^2 .

It is a cyclic number.

It is not a de Polignac number, because 63440370901 - 2¹³ = 63440362709 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 (63440370907) 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, 100063360 + ... + 100063993.

It is an arithmetic number, because the mean of its divisors is an integer number (15910124643).

Almost surely, 2^63440370901 is an apocalyptic number.

It is an amenable number.

63440370901 is a deficient number, since it is larger than the sum of its proper divisors (200127671).

63440370901 is a wasteful number, since it uses less digits than its factorization.

63440370901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200127670.

The product of its (nonzero) digits is 54432, while the sum is 37.

The spelling of 63440370901 in words is "sixty-three billion, four hundred forty million, three hundred seventy thousand, nine hundred one".