51642443478 has 32 divisors (see below), whose sum is σ = 105613743456. Its totient is φ = 16828351488.

The previous prime is 51642443459. The next prime is 51642443491. The reversal of 51642443478 is 87434424615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205051 + ... + 381222.

It is an arithmetic number, because the mean of its divisors is an integer number (3300429483).

Almost surely, 2^51642443478 is an apocalyptic number.

51642443478 is an abundant number, since it is smaller than the sum of its proper divisors (53971299978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51642443478 is a wasteful number, since it uses less digits than its factorization.

51642443478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586608.

The product of its digits is 2580480, while the sum is 48.

The spelling of 51642443478 in words is "fifty-one billion, six hundred forty-two million, four hundred forty-three thousand, four hundred seventy-eight".