51479949871 has 4 divisors (see below), whose sum is σ = 58834228432. Its totient is φ = 44125671312.

The previous prime is 51479949869. The next prime is 51479949929. The reversal of 51479949871 is 17894997415.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17894997415 = 5 ⋅3578999483.

It is a cyclic number.

It is not a de Polignac number, because 51479949871 - 2¹ = 51479949869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51479949811) 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, 3677139270 + ... + 3677139283.

It is an arithmetic number, because the mean of its divisors is an integer number (14708557108).

Almost surely, 2^51479949871 is an apocalyptic number.

51479949871 is a deficient number, since it is larger than the sum of its proper divisors (7354278561).

51479949871 is an equidigital number, since it uses as much as digits as its factorization.

51479949871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7354278560.

The product of its digits is 22861440, while the sum is 64.

The spelling of 51479949871 in words is "fifty-one billion, four hundred seventy-nine million, nine hundred forty-nine thousand, eight hundred seventy-one".