51613635663 has 24 divisors (see below), whose sum is σ = 74937128448. Its totient is φ = 34232021712.

The previous prime is 51613635649. The next prime is 51613635673. The reversal of 51613635663 is 36653631615.

51613635663 is a `hidden beast` number, since 5 + 1 + 6 + 1 + 3 + 635 + 6 + 6 + 3 = 666.

It is not a de Polignac number, because 51613635663 - 2²⁴ = 51596858447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51613635643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3337956 + ... + 3353382.

It is an arithmetic number, because the mean of its divisors is an integer number (3122380352).

Almost surely, 2^51613635663 is an apocalyptic number.

51613635663 is a deficient number, since it is larger than the sum of its proper divisors (23323492785).

51613635663 is a wasteful number, since it uses less digits than its factorization.

51613635663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17323 (or 17320 counting only the distinct ones).

The product of its digits is 874800, while the sum is 45.

The spelling of 51613635663 in words is "fifty-one billion, six hundred thirteen million, six hundred thirty-five thousand, six hundred sixty-three".