51667851905 has 8 divisors (see below), whose sum is σ = 62002698792. Its totient is φ = 41333430528.

The previous prime is 51667851883. The next prime is 51667851941. The reversal of 51667851905 is 50915876615.

It can be written as a sum of positive squares in 4 ways, for example, as 1291396096 + 50376455809 = 35936^2 + 224447^2 .

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 51667851905 - 2⁸ = 51667851649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 306329 + ... + 444041.

It is an arithmetic number, because the mean of its divisors is an integer number (7750337349).

Almost surely, 2^51667851905 is an apocalyptic number.

It is an amenable number.

51667851905 is a deficient number, since it is larger than the sum of its proper divisors (10334846887).

51667851905 is a wasteful number, since it uses less digits than its factorization.

51667851905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212755.

The product of its (nonzero) digits is 2268000, while the sum is 53.

The spelling of 51667851905 in words is "fifty-one billion, six hundred sixty-seven million, eight hundred fifty-one thousand, nine hundred five".