65638545 has 16 divisors (see below), whose sum is σ = 120024960. Its totient is φ = 30006144.

The previous prime is 65638543. The next prime is 65638561. The reversal of 65638545 is 54583656.

It is a happy number.

It is not a de Polignac number, because 65638545 - 2¹ = 65638543 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 65638497 and 65638506.

It is not an unprimeable number, because it can be changed into a prime (65638541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312460 + ... + 312669.

It is an arithmetic number, because the mean of its divisors is an integer number (7501560).

Almost surely, 2^65638545 is an apocalyptic number.

It is an amenable number.

65638545 is a deficient number, since it is larger than the sum of its proper divisors (54386415).

65638545 is a wasteful number, since it uses less digits than its factorization.

65638545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625144.

The product of its digits is 432000, while the sum is 42.

The square root of 65638545 is about 8101.7618454260. The cubic root of 65638545 is about 403.3849105698.

The spelling of 65638545 in words is "sixty-five million, six hundred thirty-eight thousand, five hundred forty-five".