51448645379 has 4 divisors (see below), whose sum is σ = 54156468840. Its totient is φ = 48740821920.

The previous prime is 51448645331. The next prime is 51448645387. The reversal of 51448645379 is 97354684415.

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 51448645379 - 2³² = 47153678083 is a prime.

It is a super-2 number, since 2×51448645379² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51448645399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1353911702 + ... + 1353911739.

It is an arithmetic number, because the mean of its divisors is an integer number (13539117210).

Almost surely, 2^51448645379 is an apocalyptic number.

51448645379 is a deficient number, since it is larger than the sum of its proper divisors (2707823461).

51448645379 is a wasteful number, since it uses less digits than its factorization.

51448645379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2707823460.

The product of its digits is 14515200, while the sum is 56.

The spelling of 51448645379 in words is "fifty-one billion, four hundred forty-eight million, six hundred forty-five thousand, three hundred seventy-nine".