51686987109 has 8 divisors (see below), whose sum is σ = 68920743360. Its totient is φ = 34455611136.

The previous prime is 51686987101. The next prime is 51686987137. The reversal of 51686987109 is 90178968615.

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

It is not a de Polignac number, because 51686987109 - 2³ = 51686987101 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51686987101) 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, 543769 + ... + 631710.

It is an arithmetic number, because the mean of its divisors is an integer number (8615092920).

Almost surely, 2^51686987109 is an apocalyptic number.

It is an amenable number.

51686987109 is a deficient number, since it is larger than the sum of its proper divisors (17233756251).

51686987109 is a wasteful number, since it uses less digits than its factorization.

51686987109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190139.

The product of its (nonzero) digits is 6531840, while the sum is 60.

The spelling of 51686987109 in words is "fifty-one billion, six hundred eighty-six million, nine hundred eighty-seven thousand, one hundred nine".