65638963 has 8 divisors (see below), whose sum is σ = 72022608. Its totient is φ = 59445984.

The previous prime is 65638961. The next prime is 65638981. The reversal of 65638963 is 36983656.

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

It is not a de Polignac number, because 65638963 - 2¹ = 65638961 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65638961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46945 + ... + 48322.

It is an arithmetic number, because the mean of its divisors is an integer number (9002826).

Almost surely, 2^65638963 is an apocalyptic number.

65638963 is a deficient number, since it is larger than the sum of its proper divisors (6383645).

65638963 is a wasteful number, since it uses less digits than its factorization.

65638963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95333.

The product of its digits is 699840, while the sum is 46.

The square root of 65638963 is about 8101.7876422429. The cubic root of 65638963 is about 403.3857668478.

The spelling of 65638963 in words is "sixty-five million, six hundred thirty-eight thousand, nine hundred sixty-three".