51611633205 has 32 divisors (see below), whose sum is σ = 90336798720. Its totient is φ = 24954089280.

The previous prime is 51611633197. The next prime is 51611633207. The reversal of 51611633205 is 50233611615.

It is not a de Polignac number, because 51611633205 - 2³ = 51611633197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51611633207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 376417 + ... + 494886.

It is an arithmetic number, because the mean of its divisors is an integer number (2823024960).

Almost surely, 2^51611633205 is an apocalyptic number.

51611633205 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51611633205 is a deficient number, since it is larger than the sum of its proper divisors (38725165515).

51611633205 is a wasteful number, since it uses less digits than its factorization.

51611633205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871681.

The product of its (nonzero) digits is 16200, while the sum is 33.

The spelling of 51611633205 in words is "fifty-one billion, six hundred eleven million, six hundred thirty-three thousand, two hundred five".