51193509916 has 24 divisors (see below), whose sum is σ = 89770751840. Its totient is φ = 25544780352.

The previous prime is 51193509911. The next prime is 51193509937. The reversal of 51193509916 is 61990539115.

It is a self number, because there is not a number n which added to its sum of digits gives 51193509916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51193509911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4221670 + ... + 4233778.

Almost surely, 2^51193509916 is an apocalyptic number.

It is an amenable number.

51193509916 is a deficient number, since it is larger than the sum of its proper divisors (38577241924).

51193509916 is a wasteful number, since it uses less digits than its factorization.

51193509916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14173 (or 14171 counting only the distinct ones).

The product of its (nonzero) digits is 328050, while the sum is 49.

The spelling of 51193509916 in words is "fifty-one billion, one hundred ninety-three million, five hundred nine thousand, nine hundred sixteen".