51980005399 has 4 divisors (see below), whose sum is σ = 59405720464. Its totient is φ = 44554290336.

The previous prime is 51980005379. The next prime is 51980005403. The reversal of 51980005399 is 99350008915.

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 51980005399 - 2⁹ = 51980004887 is a prime.

It is a super-2 number, since 2×51980005399² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51980005349) 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, 3712857522 + ... + 3712857535.

It is an arithmetic number, because the mean of its divisors is an integer number (14851430116).

Almost surely, 2^51980005399 is an apocalyptic number.

51980005399 is a deficient number, since it is larger than the sum of its proper divisors (7425715065).

51980005399 is an equidigital number, since it uses as much as digits as its factorization.

51980005399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7425715064.

The product of its (nonzero) digits is 437400, while the sum is 49.

The spelling of 51980005399 in words is "fifty-one billion, nine hundred eighty million, five thousand, three hundred ninety-nine".