51266857855 has 4 divisors (see below), whose sum is σ = 61520229432. Its totient is φ = 41013486280.

The previous prime is 51266857853. The next prime is 51266857871. The reversal of 51266857855 is 55875866215.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51266857855 - 2¹ = 51266857853 is a prime.

It is a super-3 number, since 3×51266857855³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51266857855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51266857853) 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, 5126685781 + ... + 5126685790.

It is an arithmetic number, because the mean of its divisors is an integer number (15380057358).

Almost surely, 2^51266857855 is an apocalyptic number.

51266857855 is a deficient number, since it is larger than the sum of its proper divisors (10253371577).

51266857855 is a wasteful number, since it uses less digits than its factorization.

51266857855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10253371576.

The product of its digits is 20160000, while the sum is 58.

The spelling of 51266857855 in words is "fifty-one billion, two hundred sixty-six million, eight hundred fifty-seven thousand, eight hundred fifty-five".