51005605011 has 4 divisors (see below), whose sum is σ = 68007473352. Its totient is φ = 34003736672.

The previous prime is 51005604997. The next prime is 51005605031. The reversal of 51005605011 is 11050650015.

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 51005605011 - 2²¹ = 51003507859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51005605031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8500934166 + ... + 8500934171.

It is an arithmetic number, because the mean of its divisors is an integer number (17001868338).

Almost surely, 2^51005605011 is an apocalyptic number.

51005605011 is a deficient number, since it is larger than the sum of its proper divisors (17001868341).

51005605011 is a wasteful number, since it uses less digits than its factorization.

51005605011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17001868340.

The product of its (nonzero) digits is 750, while the sum is 24.

The spelling of 51005605011 in words is "fifty-one billion, five million, six hundred five thousand, eleven".