51978881742 has 48 divisors (see below), whose sum is σ = 109802962512. Its totient is φ = 16401553920.

The previous prime is 51978881741. The next prime is 51978881803. The reversal of 51978881742 is 24718887915.

51978881742 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51978881741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2982558 + ... + 2999934.

It is an arithmetic number, because the mean of its divisors is an integer number (2287561719).

Almost surely, 2^51978881742 is an apocalyptic number.

51978881742 is an abundant number, since it is smaller than the sum of its proper divisors (57824080770).

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

51978881742 is a wasteful number, since it uses less digits than its factorization.

51978881742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18801 (or 18782 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 60.

The spelling of 51978881742 in words is "fifty-one billion, nine hundred seventy-eight million, eight hundred eighty-one thousand, seven hundred forty-two".