51136311554 has 4 divisors (see below), whose sum is σ = 76704467334. Its totient is φ = 25568155776.

The previous prime is 51136311511. The next prime is 51136311619. The reversal of 51136311554 is 45511363115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45511363115 = 5 ⋅9102272623.

It can be written as a sum of positive squares in only one way, i.e., 49366174225 + 1770137329 = 222185^2 + 42073^2 .

It is a super-2 number, since 2×51136311554² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12784077887 + ... + 12784077890.

Almost surely, 2^51136311554 is an apocalyptic number.

51136311554 is a deficient number, since it is larger than the sum of its proper divisors (25568155780).

51136311554 is a wasteful number, since it uses less digits than its factorization.

51136311554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25568155779.

The product of its digits is 27000, while the sum is 35.

Adding to 51136311554 its reverse (45511363115), we get a palindrome (96647674669).

The spelling of 51136311554 in words is "fifty-one billion, one hundred thirty-six million, three hundred eleven thousand, five hundred fifty-four".