51020199999 has 32 divisors (see below), whose sum is σ = 77298494400. Its totient is φ = 33247393920.

The previous prime is 51020199983. The next prime is 51020200013. The reversal of 51020199999 is 99999102015.

51020199999 is a `hidden beast` number, since 510 + 20 + 19 + 9 + 9 + 99 = 666.

It is not a de Polignac number, because 51020199999 - 2⁴ = 51020199983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51020199959) 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 31 ways as a sum of consecutive naturals, for example, 318669 + ... + 451209.

It is an arithmetic number, because the mean of its divisors is an integer number (2415577950).

Almost surely, 2^51020199999 is an apocalyptic number.

51020199999 is a deficient number, since it is larger than the sum of its proper divisors (26278294401).

51020199999 is a wasteful number, since it uses less digits than its factorization.

51020199999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132872 (or 132866 counting only the distinct ones).

The product of its (nonzero) digits is 590490, while the sum is 54.

The spelling of 51020199999 in words is "fifty-one billion, twenty million, one hundred ninety-nine thousand, nine hundred ninety-nine".