51357648019 has 4 divisors (see below), whose sum is σ = 51363265744. Its totient is φ = 51352030296.

The previous prime is 51357647963. The next prime is 51357648053. The reversal of 51357648019 is 91084675315.

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 51357648019 - 2⁹ = 51357647507 is a prime.

It is a super-2 number, since 2×51357648019² (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 (51357648059) 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, 2795127 + ... + 2813440.

It is an arithmetic number, because the mean of its divisors is an integer number (12840816436).

Almost surely, 2^51357648019 is an apocalyptic number.

51357648019 is a deficient number, since it is larger than the sum of its proper divisors (5617725).

51357648019 is an equidigital number, since it uses as much as digits as its factorization.

51357648019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5617724.

The product of its (nonzero) digits is 907200, while the sum is 49.

The spelling of 51357648019 in words is "fifty-one billion, three hundred fifty-seven million, six hundred forty-eight thousand, nineteen".