51566116109 has 16 divisors (see below), whose sum is σ = 55617744000. Its totient is φ = 47648839680.

The previous prime is 51566116103. The next prime is 51566116153. The reversal of 51566116109 is 90161166515.

It is a cyclic number.

It is not a de Polignac number, because 51566116109 - 2²⁸ = 51297680653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51566116103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5829512 + ... + 5838350.

It is an arithmetic number, because the mean of its divisors is an integer number (3476109000).

Almost surely, 2^51566116109 is an apocalyptic number.

It is an amenable number.

51566116109 is a deficient number, since it is larger than the sum of its proper divisors (4051627891).

51566116109 is a wasteful number, since it uses less digits than its factorization.

51566116109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16388.

The product of its (nonzero) digits is 48600, while the sum is 41.

The spelling of 51566116109 in words is "fifty-one billion, five hundred sixty-six million, one hundred sixteen thousand, one hundred nine".