51771319646 has 8 divisors (see below), whose sum is σ = 78973199640. Its totient is φ = 25446919768.

The previous prime is 51771319609. The next prime is 51771319657. The reversal of 51771319646 is 64691317715.

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

It is a junction number, because it is equal to n+sod(n) for n = 51771319594 and 51771319603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219369881 + ... + 219370116.

It is an arithmetic number, because the mean of its divisors is an integer number (9871649955).

Almost surely, 2^51771319646 is an apocalyptic number.

51771319646 is a deficient number, since it is larger than the sum of its proper divisors (27201879994).

51771319646 is a wasteful number, since it uses less digits than its factorization.

51771319646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438740058.

The product of its digits is 952560, while the sum is 50.

The spelling of 51771319646 in words is "fifty-one billion, seven hundred seventy-one million, three hundred nineteen thousand, six hundred forty-six".