51611815211 has 8 divisors (see below), whose sum is σ = 57258100800. Its totient is φ = 46124580040.

The previous prime is 51611815163. The next prime is 51611815223. The reversal of 51611815211 is 11251811615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51611815211 - 2⁶ = 51611815147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51611815231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39761921 + ... + 39763218.

It is an arithmetic number, because the mean of its divisors is an integer number (7157262600).

Almost surely, 2^51611815211 is an apocalyptic number.

51611815211 is a deficient number, since it is larger than the sum of its proper divisors (5646285589).

51611815211 is a wasteful number, since it uses less digits than its factorization.

51611815211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79525209.

The product of its digits is 2400, while the sum is 32.

The spelling of 51611815211 in words is "fifty-one billion, six hundred eleven million, eight hundred fifteen thousand, two hundred eleven".