65500011421 has 4 divisors (see below), whose sum is σ = 70538473852. Its totient is φ = 60461548992.

The previous prime is 65500011413. The next prime is 65500011431. The reversal of 65500011421 is 12411000556.

It is a happy number.

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 8012756196 + 57487255225 = 89514^2 + 239765^2 .

It is not a de Polignac number, because 65500011421 - 2³ = 65500011413 is a prime.

It is a super-2 number, since 2×65500011421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65500011431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2519231196 + ... + 2519231221.

It is an arithmetic number, because the mean of its divisors is an integer number (17634618463).

Almost surely, 2^65500011421 is an apocalyptic number.

It is an amenable number.

65500011421 is a deficient number, since it is larger than the sum of its proper divisors (5038462431).

65500011421 is a wasteful number, since it uses less digits than its factorization.

65500011421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5038462430.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 65500011421 its reverse (12411000556), we get a palindrome (77911011977).

The spelling of 65500011421 in words is "sixty-five billion, five hundred million, eleven thousand, four hundred twenty-one".