51521271803 has 4 divisors (see below), whose sum is σ = 51544918440. Its totient is φ = 51497625168.

The previous prime is 51521271761. The next prime is 51521271811. The reversal of 51521271803 is 30817212515.

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 51521271803 - 2²² = 51517077499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51521273803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11820050 + ... + 11824407.

It is an arithmetic number, because the mean of its divisors is an integer number (12886229610).

Almost surely, 2^51521271803 is an apocalyptic number.

51521271803 is a deficient number, since it is larger than the sum of its proper divisors (23646637).

51521271803 is a wasteful number, since it uses less digits than its factorization.

51521271803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23646636.

The product of its (nonzero) digits is 16800, while the sum is 35.

The spelling of 51521271803 in words is "fifty-one billion, five hundred twenty-one million, two hundred seventy-one thousand, eight hundred three".