51765478511 has 8 divisors (see below), whose sum is σ = 54919034880. Its totient is φ = 48654827928.

The previous prime is 51765478493. The next prime is 51765478553. The reversal of 51765478511 is 11587456715.

51765478511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 51765478511 - 2¹⁰ = 51765477487 is a prime.

It is a super-4 number, since 4×51765478511⁴ (a number of 44 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51765478511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51765478571) 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, 10723961 + ... + 10728786.

It is an arithmetic number, because the mean of its divisors is an integer number (6864879360).

Almost surely, 2^51765478511 is an apocalyptic number.

51765478511 is a deficient number, since it is larger than the sum of its proper divisors (3153556369).

51765478511 is a wasteful number, since it uses less digits than its factorization.

51765478511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21452893.

The product of its digits is 1176000, while the sum is 50.

The spelling of 51765478511 in words is "fifty-one billion, seven hundred sixty-five million, four hundred seventy-eight thousand, five hundred eleven".