51105984725 has 6 divisors (see below), whose sum is σ = 63371421090. Its totient is φ = 40884787760.

The previous prime is 51105984703. The next prime is 51105984733. The reversal of 51105984725 is 52748950115.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 904445476 + 50201539249 = 30074^2 + 224057^2 .

It is not a de Polignac number, because 51105984725 - 2⁶ = 51105984661 is a prime.

It is a super-2 number, since 2×51105984725² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51105984725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1022119670 + ... + 1022119719.

It is an arithmetic number, because the mean of its divisors is an integer number (10561903515).

Almost surely, 2^51105984725 is an apocalyptic number.

It is an amenable number.

51105984725 is a deficient number, since it is larger than the sum of its proper divisors (12265436365).

51105984725 is a wasteful number, since it uses less digits than its factorization.

51105984725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2044239399 (or 2044239394 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 47.

The spelling of 51105984725 in words is "fifty-one billion, one hundred five million, nine hundred eighty-four thousand, seven hundred twenty-five".