51672281781569 has 4 divisors (see below), whose sum is σ = 51672366458196. Its totient is φ = 51672197104944.

The previous prime is 51672281781559. The next prime is 51672281781619. The reversal of 51672281781569 is 96518718227615.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41844558375169 + 9827723406400 = 6468737^2 + 3134920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51672281781569 is a prime.

It is a super-2 number, since 2×51672281781569² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51672281781499 and 51672281781508.

It is not an unprimeable number, because it can be changed into a prime (51672281781539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41416274 + ... + 42645659.

It is an arithmetic number, because the mean of its divisors is an integer number (12918091614549).

Almost surely, 2^{51672281781569} is an apocalyptic number.

It is an amenable number.

51672281781569 is a deficient number, since it is larger than the sum of its proper divisors (84676627).

51672281781569 is an equidigital number, since it uses as much as digits as its factorization.

51672281781569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84676626.

The product of its digits is 101606400, while the sum is 68.

The spelling of 51672281781569 in words is "fifty-one trillion, six hundred seventy-two billion, two hundred eighty-one million, seven hundred eighty-one thousand, five hundred sixty-nine".