65681638 has 8 divisors (see below), whose sum is σ = 107479080. Its totient is φ = 29855280.

The previous prime is 65681617. The next prime is 65681639. The reversal of 65681638 is 83618656.

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

It is a junction number, because it is equal to n+sod(n) for n = 65681594 and 65681603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65681639) 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, 1492743 + ... + 1492786.

It is an arithmetic number, because the mean of its divisors is an integer number (13434885).

Almost surely, 2^65681638 is an apocalyptic number.

65681638 is a deficient number, since it is larger than the sum of its proper divisors (41797442).

65681638 is a wasteful number, since it uses less digits than its factorization.

65681638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985542.

The product of its digits is 207360, while the sum is 43.

The square root of 65681638 is about 8104.4208923278. The cubic root of 65681638 is about 403.4731679762.

The spelling of 65681638 in words is "sixty-five million, six hundred eighty-one thousand, six hundred thirty-eight".