63440661 has 8 divisors (see below), whose sum is σ = 87504480. Its totient is φ = 40835312.

The previous prime is 63440659. The next prime is 63440669. The reversal of 63440661 is 16604436.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63440661 - 2¹ = 63440659 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63440669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 364515 + ... + 364688.

It is an arithmetic number, because the mean of its divisors is an integer number (10938060).

Almost surely, 2^63440661 is an apocalyptic number.

It is an amenable number.

63440661 is a deficient number, since it is larger than the sum of its proper divisors (24063819).

63440661 is a wasteful number, since it uses less digits than its factorization.

63440661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729235.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 63440661 is about 7964.9645950249. The cubic root of 63440661 is about 398.8312990877.

The spelling of 63440661 in words is "sixty-three million, four hundred forty thousand, six hundred sixty-one".