65541638 has 4 divisors (see below), whose sum is σ = 98312460. Its totient is φ = 32770818.

The previous prime is 65541631. The next prime is 65541661. The reversal of 65541638 is 83614556.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65541631) 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 as a sum of consecutive naturals, namely, 16385408 + ... + 16385411.

It is an arithmetic number, because the mean of its divisors is an integer number (24578115).

Almost surely, 2^65541638 is an apocalyptic number.

65541638 is a deficient number, since it is larger than the sum of its proper divisors (32770822).

65541638 is a wasteful number, since it uses less digits than its factorization.

65541638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32770821.

The product of its digits is 86400, while the sum is 38.

The square root of 65541638 is about 8095.7790236641. The cubic root of 65541638 is about 403.1862972150.

It can be divided in two parts, 6554 and 1638, that added together give a 13-th power (8192 = 2¹³).

The spelling of 65541638 in words is "sixty-five million, five hundred forty-one thousand, six hundred thirty-eight".