51111054685 has 4 divisors (see below), whose sum is σ = 61333265628. Its totient is φ = 40888843744.

The previous prime is 51111054679. The next prime is 51111054691. The reversal of 51111054685 is 58645011115.

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

It is an interprime number because it is at equal distance from previous prime (51111054679) and next prime (51111054691).

It can be written as a sum of positive squares in 2 ways, for example, as 7655900004 + 43455154681 = 87498^2 + 208459^2 .

It is a cyclic number.

It is not a de Polignac number, because 51111054685 - 2²⁷ = 50976836957 is a prime.

It is a super-2 number, since 2×51111054685² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5111105464 + ... + 5111105473.

It is an arithmetic number, because the mean of its divisors is an integer number (15333316407).

Almost surely, 2^51111054685 is an apocalyptic number.

It is an amenable number.

51111054685 is a deficient number, since it is larger than the sum of its proper divisors (10222210943).

51111054685 is a wasteful number, since it uses less digits than its factorization.

51111054685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10222210942.

The product of its (nonzero) digits is 24000, while the sum is 37.

The spelling of 51111054685 in words is "fifty-one billion, one hundred eleven million, fifty-four thousand, six hundred eighty-five".