51005650191 has 4 divisors (see below), whose sum is σ = 68007533592. Its totient is φ = 34003766792.

The previous prime is 51005650183. The next prime is 51005650229. The reversal of 51005650191 is 19105650015.

51005650191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51005650191 - 2³ = 51005650183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51005650141) 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, 8500941696 + ... + 8500941701.

It is an arithmetic number, because the mean of its divisors is an integer number (17001883398).

Almost surely, 2^51005650191 is an apocalyptic number.

51005650191 is a deficient number, since it is larger than the sum of its proper divisors (17001883401).

51005650191 is a wasteful number, since it uses less digits than its factorization.

51005650191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17001883400.

The product of its (nonzero) digits is 6750, while the sum is 33.

The spelling of 51005650191 in words is "fifty-one billion, five million, six hundred fifty thousand, one hundred ninety-one".