51511444425 has 96 divisors (see below), whose sum is σ = 109628975360. Its totient is φ = 23225356800.

The previous prime is 51511444417. The next prime is 51511444427. The reversal of 51511444425 is 52444411515.

51511444425 is a `hidden beast` number, since 515 + 114 + 4 + 4 + 4 + 25 = 666.

It is not a de Polignac number, because 51511444425 - 2³ = 51511444417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51511444425.

It is not an unprimeable number, because it can be changed into a prime (51511444427) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 270255 + ... + 419595.

Almost surely, 2^51511444425 is an apocalyptic number.

It is an amenable number.

51511444425 is an abundant number, since it is smaller than the sum of its proper divisors (58117530935).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51511444425 is a wasteful number, since it uses less digits than its factorization.

51511444425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149440 (or 149429 counting only the distinct ones).

The product of its digits is 64000, while the sum is 36.

The spelling of 51511444425 in words is "fifty-one billion, five hundred eleven million, four hundred forty-four thousand, four hundred twenty-five".