51506506011 has 8 divisors (see below), whose sum is σ = 69801166864. Its totient is φ = 33774757920.

The previous prime is 51506505997. The next prime is 51506506013. The reversal of 51506506011 is 11060560515.

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

It is not a de Polignac number, because 51506506011 - 2²⁹ = 50969635099 is a prime.

It is a super-2 number, since 2×51506506011² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51506506011.

It is not an unprimeable number, because it can be changed into a prime (51506506013) 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, 140727976 + ... + 140728341.

It is an arithmetic number, because the mean of its divisors is an integer number (8725145858).

Almost surely, 2^51506506011 is an apocalyptic number.

51506506011 is a deficient number, since it is larger than the sum of its proper divisors (18294660853).

51506506011 is a wasteful number, since it uses less digits than its factorization.

51506506011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281456381.

The product of its (nonzero) digits is 4500, while the sum is 30.

The spelling of 51506506011 in words is "fifty-one billion, five hundred six million, five hundred six thousand, eleven".