51020872449 has 4 divisors (see below), whose sum is σ = 68027829936. Its totient is φ = 34013914964.

The previous prime is 51020872403. The next prime is 51020872459. The reversal of 51020872449 is 94427802015.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51020872449 - 2²⁰ = 51019823873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51020872449.

It is not an unprimeable number, because it can be changed into a prime (51020872459) 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, 8503478739 + ... + 8503478744.

It is an arithmetic number, because the mean of its divisors is an integer number (17006957484).

Almost surely, 2^51020872449 is an apocalyptic number.

It is an amenable number.

51020872449 is a deficient number, since it is larger than the sum of its proper divisors (17006957487).

51020872449 is a wasteful number, since it uses less digits than its factorization.

51020872449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17006957486.

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 51020872449 in words is "fifty-one billion, twenty million, eight hundred seventy-two thousand, four hundred forty-nine".