50991355980000 has 960 divisors, whose sum is σ = 193776371712000. Its totient is φ = 13024924416000.

The previous prime is 50991355979959. The next prime is 50991355980017. The reversal of 50991355980000 is 8955319905.

It is a happy number.

50991355980000 is a `hidden beast` number, since 5 + 0 + 9 + 9 + 1 + 3 + 559 + 80 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1988807181 + ... + 1988832819.

It is an arithmetic number, because the mean of its divisors is an integer number (201850387200).

Almost surely, 2^{50991355980000} is an apocalyptic number.

50991355980000 is a gapful number since it is divisible by the number (50) 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 50991355980000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96888185856000).

50991355980000 is an abundant number, since it is smaller than the sum of its proper divisors (142785015732000).

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

50991355980000 is a wasteful number, since it uses less digits than its factorization.

50991355980000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25834 (or 25805 counting only the distinct ones).

The product of its (nonzero) digits is 2187000, while the sum is 54.

The spelling of 50991355980000 in words is "fifty trillion, nine hundred ninety-one billion, three hundred fifty-five million, nine hundred eighty thousand".