51117600637 has 4 divisors (see below), whose sum is σ = 51122006460. Its totient is φ = 51113194816.

The previous prime is 51117600619. The next prime is 51117600683. The reversal of 51117600637 is 73600671115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73600671115 = 5 ⋅14720134223.

It can be written as a sum of positive squares in 2 ways, for example, as 17283309156 + 33834291481 = 131466^2 + 183941^2 .

It is a cyclic number.

It is not a de Polignac number, because 51117600637 - 2¹¹ = 51117598589 is a prime.

It is a super-2 number, since 2×51117600637² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51117600596 and 51117600605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51117600337) 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, 2185462 + ... + 2208727.

It is an arithmetic number, because the mean of its divisors is an integer number (12780501615).

Almost surely, 2^51117600637 is an apocalyptic number.

It is an amenable number.

51117600637 is a deficient number, since it is larger than the sum of its proper divisors (4405823).

51117600637 is a wasteful number, since it uses less digits than its factorization.

51117600637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405822.

The product of its (nonzero) digits is 26460, while the sum is 37.

The spelling of 51117600637 in words is "fifty-one billion, one hundred seventeen million, six hundred thousand, six hundred thirty-seven".