51454188866 has 4 divisors (see below), whose sum is σ = 77181283302. Its totient is φ = 25727094432.

The previous prime is 51454188839. The next prime is 51454188887. The reversal of 51454188866 is 66888145415.

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

It can be written as a sum of positive squares in only one way, i.e., 41648238241 + 9805950625 = 204079^2 + 99025^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12863547215 + ... + 12863547218.

Almost surely, 2^51454188866 is an apocalyptic number.

51454188866 is a deficient number, since it is larger than the sum of its proper divisors (25727094436).

51454188866 is a wasteful number, since it uses less digits than its factorization.

51454188866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25727094435.

The product of its digits is 7372800, while the sum is 56.

The spelling of 51454188866 in words is "fifty-one billion, four hundred fifty-four million, one hundred eighty-eight thousand, eight hundred sixty-six".