51393986161 has 32 divisors (see below), whose sum is σ = 60740951040. Its totient is φ = 42565824000.

The previous prime is 51393986107. The next prime is 51393986177. The reversal of 51393986161 is 16168939315.

It is not a de Polignac number, because 51393986161 - 2⁹ = 51393985649 is a prime.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 51393986099 and 51393986108.

It is not an unprimeable number, because it can be changed into a prime (51393986261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28535461 + ... + 28537261.

It is an arithmetic number, because the mean of its divisors is an integer number (1898154720).

Almost surely, 2^51393986161 is an apocalyptic number.

It is an amenable number.

51393986161 is a deficient number, since it is larger than the sum of its proper divisors (9346964879).

51393986161 is a wasteful number, since it uses less digits than its factorization.

51393986161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545.

The product of its digits is 1049760, while the sum is 52.

The spelling of 51393986161 in words is "fifty-one billion, three hundred ninety-three million, nine hundred eighty-six thousand, one hundred sixty-one".