51505115187 has 8 divisors (see below), whose sum is σ = 68684414400. Its totient is φ = 34331279720.

The previous prime is 51505115173. The next prime is 51505115191. The reversal of 51505115187 is 78151150515.

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

It is a cyclic number.

It is not a de Polignac number, because 51505115187 - 2⁴ = 51505115171 is a prime.

It is a super-2 number, since 2×51505115187² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51505115117) 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, 1343889 + ... + 1381682.

It is an arithmetic number, because the mean of its divisors is an integer number (8585551800).

Almost surely, 2^51505115187 is an apocalyptic number.

51505115187 is a deficient number, since it is larger than the sum of its proper divisors (17179299213).

51505115187 is a wasteful number, since it uses less digits than its factorization.

51505115187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731873.

The product of its (nonzero) digits is 35000, while the sum is 39.

The spelling of 51505115187 in words is "fifty-one billion, five hundred five million, one hundred fifteen thousand, one hundred eighty-seven".