51784919642 has 8 divisors (see below), whose sum is σ = 78010759476. Its totient is φ = 25781333152.

The previous prime is 51784919639. The next prime is 51784919657. The reversal of 51784919642 is 24691948715.

51784919642 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 38130763441 + 13654156201 = 195271^2 + 116851^2 .

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, 55562753 + ... + 55563684.

Almost surely, 2^51784919642 is an apocalyptic number.

51784919642 is a deficient number, since it is larger than the sum of its proper divisors (26225839834).

51784919642 is a wasteful number, since it uses less digits than its factorization.

51784919642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111126672.

The product of its digits is 4354560, while the sum is 56.

The spelling of 51784919642 in words is "fifty-one billion, seven hundred eighty-four million, nine hundred nineteen thousand, six hundred forty-two".