51175381817 has 16 divisors (see below), whose sum is σ = 59744397312. Its totient is φ = 42921361680.

The previous prime is 51175381813. The next prime is 51175381861. The reversal of 51175381817 is 71818357115.

It is a cyclic number.

It is not a de Polignac number, because 51175381817 - 2² = 51175381813 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51175381811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1630442 + ... + 1661532.

It is an arithmetic number, because the mean of its divisors is an integer number (3734024832).

Almost surely, 2^51175381817 is an apocalyptic number.

It is an amenable number.

51175381817 is a deficient number, since it is larger than the sum of its proper divisors (8569015495).

51175381817 is a wasteful number, since it uses less digits than its factorization.

51175381817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36148.

The product of its digits is 235200, while the sum is 47.

The spelling of 51175381817 in words is "fifty-one billion, one hundred seventy-five million, three hundred eighty-one thousand, eight hundred seventeen".