51403687418 has 4 divisors (see below), whose sum is σ = 77105531130. Its totient is φ = 25701843708.

The previous prime is 51403687417. The next prime is 51403687471. The reversal of 51403687418 is 81478630415.

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., 34246093249 + 17157594169 = 185057^2 + 130987^2 .

It is not an unprimeable number, because it can be changed into a prime (51403687417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12850921853 + ... + 12850921856.

Almost surely, 2^51403687418 is an apocalyptic number.

51403687418 is a deficient number, since it is larger than the sum of its proper divisors (25701843712).

51403687418 is a wasteful number, since it uses less digits than its factorization.

51403687418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25701843711.

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 51403687418 in words is "fifty-one billion, four hundred three million, six hundred eighty-seven thousand, four hundred eighteen".