65138477 has 4 divisors (see below), whose sum is σ = 65870460. Its totient is φ = 64406496.

The previous prime is 65138429. The next prime is 65138519. The reversal of 65138477 is 77483156.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19589476 + 45549001 = 4426^2 + 6749^2 .

It is a cyclic number.

It is not a de Polignac number, because 65138477 - 2⁸ = 65138221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65138417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365858 + ... + 366035.

It is an arithmetic number, because the mean of its divisors is an integer number (16467615).

Almost surely, 2^65138477 is an apocalyptic number.

It is an amenable number.

65138477 is a deficient number, since it is larger than the sum of its proper divisors (731983).

65138477 is an equidigital number, since it uses as much as digits as its factorization.

65138477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731982.

The product of its digits is 141120, while the sum is 41.

The square root of 65138477 is about 8070.8411581445. The cubic root of 65138477 is about 402.3579005351.

The spelling of 65138477 in words is "sixty-five million, one hundred thirty-eight thousand, four hundred seventy-seven".