51800918506 has 8 divisors (see below), whose sum is σ = 77712730020. Its totient is φ = 25896675168.

The previous prime is 51800918497. The next prime is 51800918549. The reversal of 51800918506 is 60581900815.

51800918506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 39277294225 + 12523624281 = 198185^2 + 111909^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1874901 + ... + 1902328.

Almost surely, 2^51800918506 is an apocalyptic number.

51800918506 is a deficient number, since it is larger than the sum of its proper divisors (25911811514).

51800918506 is a wasteful number, since it uses less digits than its factorization.

51800918506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3784088.

The product of its (nonzero) digits is 86400, while the sum is 43.

The spelling of 51800918506 in words is "fifty-one billion, eight hundred million, nine hundred eighteen thousand, five hundred six".