51347367665 has 32 divisors (see below), whose sum is σ = 73196092800. Its totient is φ = 34158136320.

The previous prime is 51347367637. The next prime is 51347367689. The reversal of 51347367665 is 56676374315.

It is a happy number.

It is not a de Polignac number, because 51347367665 - 2¹⁰ = 51347366641 is a prime.

It is a super-2 number, since 2×51347367665² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 816872 + ... + 877481.

It is an arithmetic number, because the mean of its divisors is an integer number (2287377900).

Almost surely, 2^51347367665 is an apocalyptic number.

51347367665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51347367665 is a deficient number, since it is larger than the sum of its proper divisors (21848725135).

51347367665 is a wasteful number, since it uses less digits than its factorization.

51347367665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694417.

The product of its digits is 9525600, while the sum is 53.

The spelling of 51347367665 in words is "fifty-one billion, three hundred forty-seven million, three hundred sixty-seven thousand, six hundred sixty-five".