51442980444 has 144 divisors (see below), whose sum is σ = 136148812800. Its totient is φ = 16983763776.

The previous prime is 51442980439. The next prime is 51442980461. The reversal of 51442980444 is 44408924415.

51442980444 is a `hidden beast` number, since 514 + 4 + 2 + 98 + 0 + 4 + 44 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 51442980444.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53198049 + ... + 53199015.

Almost surely, 2^51442980444 is an apocalyptic number.

51442980444 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51442980444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68074406400).

51442980444 is an abundant number, since it is smaller than the sum of its proper divisors (84705832356).

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

51442980444 is a wasteful number, since it uses less digits than its factorization.

51442980444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454 (or 1440 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 45.

The spelling of 51442980444 in words is "fifty-one billion, four hundred forty-two million, nine hundred eighty thousand, four hundred forty-four".