51999999946 has 8 divisors (see below), whose sum is σ = 78010661664. Its totient is φ = 25996446060.

The previous prime is 51999999937. The next prime is 51999999971. The reversal of 51999999946 is 64999999915.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1758630 + ... + 1787953.

It is an arithmetic number, because the mean of its divisors is an integer number (9751332708).

Almost surely, 2^51999999946 is an apocalyptic number.

51999999946 is a deficient number, since it is larger than the sum of its proper divisors (26010661718).

51999999946 is a wasteful number, since it uses less digits than its factorization.

51999999946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3553916.

The product of its digits is 573956280, while the sum is 79.

Adding to 51999999946 its sum of digits (79), we get a palindrome (52000000025).

The spelling of 51999999946 in words is "fifty-one billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty-six".