51638687807 has 32 divisors (see below), whose sum is σ = 64682016768. Its totient is φ = 40212619776.

The previous prime is 51638687801. The next prime is 51638687827. The reversal of 51638687807 is 70878683615.

It is a happy number.

It is not a de Polignac number, because 51638687807 - 2²² = 51634493503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51638687801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 513008 + ... + 605354.

It is an arithmetic number, because the mean of its divisors is an integer number (2021313024).

Almost surely, 2^51638687807 is an apocalyptic number.

51638687807 is a deficient number, since it is larger than the sum of its proper divisors (13043328961).

51638687807 is a wasteful number, since it uses less digits than its factorization.

51638687807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92535.

The product of its (nonzero) digits is 13547520, while the sum is 59.

The spelling of 51638687807 in words is "fifty-one billion, six hundred thirty-eight million, six hundred eighty-seven thousand, eight hundred seven".