51642443456 has 14 divisors (see below), whose sum is σ = 102477973860. Its totient is φ = 25821221696.

The previous prime is 51642443449. The next prime is 51642443459. The reversal of 51642443456 is 65434424615.

It is a super-2 number, since 2×51642443456² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51642443459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403456526 + ... + 403456653.

Almost surely, 2^51642443456 is an apocalyptic number.

It is an amenable number.

51642443456 is a deficient number, since it is larger than the sum of its proper divisors (50835530404).

51642443456 is an equidigital number, since it uses as much as digits as its factorization.

51642443456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806913191 (or 806913181 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 44.

The spelling of 51642443456 in words is "fifty-one billion, six hundred forty-two million, four hundred forty-three thousand, four hundred fifty-six".