51771887366 has 4 divisors (see below), whose sum is σ = 77657831052. Its totient is φ = 25885943682.

The previous prime is 51771887333. The next prime is 51771887381. The reversal of 51771887366 is 66378817715.

It is a happy number.

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, 12942971840 + ... + 12942971843.

It is an arithmetic number, because the mean of its divisors is an integer number (19414457763).

Almost surely, 2^51771887366 is an apocalyptic number.

51771887366 is a deficient number, since it is larger than the sum of its proper divisors (25885943686).

51771887366 is a wasteful number, since it uses less digits than its factorization.

51771887366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25885943685.

The product of its digits is 11854080, while the sum is 59.

The spelling of 51771887366 in words is "fifty-one billion, seven hundred seventy-one million, eight hundred eighty-seven thousand, three hundred sixty-six".