51236644665 has 8 divisors (see below), whose sum is σ = 81978631488. Its totient is φ = 27326210480.

The previous prime is 51236644663. The next prime is 51236644673. The reversal of 51236644665 is 56644663215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51236644665 - 2¹ = 51236644663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51236644663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1707888141 + ... + 1707888170.

It is an arithmetic number, because the mean of its divisors is an integer number (10247328936).

Almost surely, 2^51236644665 is an apocalyptic number.

It is an amenable number.

51236644665 is a deficient number, since it is larger than the sum of its proper divisors (30741986823).

51236644665 is a wasteful number, since it uses less digits than its factorization.

51236644665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3415776319.

The product of its digits is 3110400, while the sum is 48.

The spelling of 51236644665 in words is "fifty-one billion, two hundred thirty-six million, six hundred forty-four thousand, six hundred sixty-five".