51135027697 has 16 divisors (see below), whose sum is σ = 56180189520. Its totient is φ = 46258071552.

The previous prime is 51135027673. The next prime is 51135027707. The reversal of 51135027697 is 79672053115.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 8246274481 + 42888753216 = 90809^2 + 207096^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51135027697 is a prime.

It is a super-2 number, since 2×51135027697² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51135007697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64818 + ... + 326299.

It is an arithmetic number, because the mean of its divisors is an integer number (3511261845).

Almost surely, 2^51135027697 is an apocalyptic number.

It is an amenable number.

51135027697 is a deficient number, since it is larger than the sum of its proper divisors (5045161823).

51135027697 is a wasteful number, since it uses less digits than its factorization.

51135027697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391332.

The product of its (nonzero) digits is 396900, while the sum is 46.

The spelling of 51135027697 in words is "fifty-one billion, one hundred thirty-five million, twenty-seven thousand, six hundred ninety-seven".