51404940019 has 2 divisors, whose sum is σ = 51404940020. Its totient is φ = 51404940018.

The previous prime is 51404940007. The next prime is 51404940043. The reversal of 51404940019 is 91004940415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51404940019 - 2¹¹ = 51404937971 is a prime.

It is a super-2 number, since 2×51404940019² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51404940019.

It is not a weakly prime, because it can be changed into another prime (51404940079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25702470009 + 25702470010.

It is an arithmetic number, because the mean of its divisors is an integer number (25702470010).

Almost surely, 2^51404940019 is an apocalyptic number.

51404940019 is a deficient number, since it is larger than the sum of its proper divisors (1).

51404940019 is an equidigital number, since it uses as much as digits as its factorization.

51404940019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 51404940019 in words is "fifty-one billion, four hundred four million, nine hundred forty thousand, nineteen".