51005651209 has 8 divisors (see below), whose sum is σ = 51380239680. Its totient is φ = 50631172176.

The previous prime is 51005651201. The next prime is 51005651219. The reversal of 51005651209 is 90215650015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51005651209 - 2³ = 51005651201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51005651201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1068204 + ... + 1114930.

It is an arithmetic number, because the mean of its divisors is an integer number (6422529960).

Almost surely, 2^51005651209 is an apocalyptic number.

It is an amenable number.

51005651209 is a deficient number, since it is larger than the sum of its proper divisors (374588471).

51005651209 is a wasteful number, since it uses less digits than its factorization.

51005651209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54719.

The product of its (nonzero) digits is 13500, while the sum is 34.

The spelling of 51005651209 in words is "fifty-one billion, five million, six hundred fifty-one thousand, two hundred nine".