51187478291198 has 4 divisors (see below), whose sum is σ = 76781217436800. Its totient is φ = 25593739145598.

The previous prime is 51187478291093. The next prime is 51187478291207. The reversal of 51187478291198 is 89119287478115.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12796869572798 + ... + 12796869572801.

It is an arithmetic number, because the mean of its divisors is an integer number (19195304359200).

Almost surely, 2^{51187478291198} is an apocalyptic number.

51187478291198 is a deficient number, since it is larger than the sum of its proper divisors (25593739145602).

51187478291198 is a wasteful number, since it uses less digits than its factorization.

51187478291198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25593739145601.

The product of its digits is 81285120, while the sum is 71.

The spelling of 51187478291198 in words is "fifty-one trillion, one hundred eighty-seven billion, four hundred seventy-eight million, two hundred ninety-one thousand, one hundred ninety-eight".