51183216551 has 4 divisors (see below), whose sum is σ = 52148937672. Its totient is φ = 50217495432.

The previous prime is 51183216527. The next prime is 51183216571. The reversal of 51183216551 is 15561238115.

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: 15561238115 = 5 ⋅3112247623.

It is a cyclic number.

It is not a de Polignac number, because 51183216551 - 2²² = 51179022247 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 (51183216571) 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, 482860481 + ... + 482860586.

It is an arithmetic number, because the mean of its divisors is an integer number (13037234418).

Almost surely, 2^51183216551 is an apocalyptic number.

51183216551 is a deficient number, since it is larger than the sum of its proper divisors (965721121).

51183216551 is an equidigital number, since it uses as much as digits as its factorization.

51183216551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965721120.

The product of its digits is 36000, while the sum is 38.

The spelling of 51183216551 in words is "fifty-one billion, one hundred eighty-three million, two hundred sixteen thousand, five hundred fifty-one".