51665917425 has 12 divisors (see below), whose sum is σ = 85420983600. Its totient is φ = 27555155920.

The previous prime is 51665917423. The next prime is 51665917453. The reversal of 51665917425 is 52471956615.

51665917425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51665917425 - 2¹ = 51665917423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51665917423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 344439375 + ... + 344439524.

It is an arithmetic number, because the mean of its divisors is an integer number (7118415300).

Almost surely, 2^51665917425 is an apocalyptic number.

It is an amenable number.

51665917425 is a deficient number, since it is larger than the sum of its proper divisors (33755066175).

51665917425 is a wasteful number, since it uses less digits than its factorization.

51665917425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688878912 (or 688878907 counting only the distinct ones).

The product of its digits is 2268000, while the sum is 51.

The spelling of 51665917425 in words is "fifty-one billion, six hundred sixty-five million, nine hundred seventeen thousand, four hundred twenty-five".