51202020215 has 4 divisors (see below), whose sum is σ = 61442424264. Its totient is φ = 40961616168.

The previous prime is 51202020179. The next prime is 51202020217.

It is a happy number.

51202020215 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 51202020215 - 2¹⁰ = 51202019191 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 (51202020217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5120202017 + ... + 5120202026.

It is an arithmetic number, because the mean of its divisors is an integer number (15360606066).

Almost surely, 2^51202020215 is an apocalyptic number.

51202020215 is a deficient number, since it is larger than the sum of its proper divisors (10240404049).

51202020215 is a wasteful number, since it uses less digits than its factorization.

51202020215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10240404048.

The product of its (nonzero) digits is 400, while the sum is 20.

It can be divided in two parts, 512020 and 20215, that added together give a palindrome (532235).

The spelling of 51202020215 in words is "fifty-one billion, two hundred two million, twenty thousand, two hundred fifteen".