50991089677920 has 768 divisors, whose sum is σ = 212932305653760. Its totient is φ = 11143128268800.

The previous prime is 50991089677907. The next prime is 50991089677951. The reversal of 50991089677920 is 2977698019905.

50991089677920 is a `hidden beast` number, since 509 + 9 + 1 + 0 + 8 + 96 + 7 + 7 + 9 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1586465050 + ... + 1586497190.

It is an arithmetic number, because the mean of its divisors is an integer number (277255606320).

Almost surely, 2^{50991089677920} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 50991089677920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106466152826880).

50991089677920 is an abundant number, since it is smaller than the sum of its proper divisors (161941215975840).

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

50991089677920 is a wasteful number, since it uses less digits than its factorization.

50991089677920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34476 (or 34462 counting only the distinct ones).

The product of its (nonzero) digits is 154314720, while the sum is 72.

The spelling of 50991089677920 in words is "fifty trillion, nine hundred ninety-one billion, eighty-nine million, six hundred seventy-seven thousand, nine hundred twenty".