51881825407 has 4 divisors (see below), whose sum is σ = 52761178440. Its totient is φ = 51002472376.

The previous prime is 51881825323. The next prime is 51881825431. The reversal of 51881825407 is 70452818815.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51881825407 - 2⁷ = 51881825279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51881825447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439676428 + ... + 439676545.

It is an arithmetic number, because the mean of its divisors is an integer number (13190294610).

Almost surely, 2^51881825407 is an apocalyptic number.

51881825407 is a deficient number, since it is larger than the sum of its proper divisors (879353033).

51881825407 is an equidigital number, since it uses as much as digits as its factorization.

51881825407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879353032.

The product of its (nonzero) digits is 716800, while the sum is 49.

The spelling of 51881825407 in words is "fifty-one billion, eight hundred eighty-one million, eight hundred twenty-five thousand, four hundred seven".