19951611485520 has 480 divisors, whose sum is σ = 73402158211200. Its totient is φ = 4453186129920.

The previous prime is 19951611485479. The next prime is 19951611485557. The reversal of 19951611485520 is 2558411615991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 146787351 + ... + 146923209.

It is an arithmetic number, because the mean of its divisors is an integer number (152921162940).

Almost surely, 2^{19951611485520} is an apocalyptic number.

19951611485520 is a gapful number since it is divisible by the number (10) 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 19951611485520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36701079105600).

19951611485520 is an abundant number, since it is smaller than the sum of its proper divisors (53450546725680).

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

19951611485520 is a wasteful number, since it uses less digits than its factorization.

19951611485520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136299 (or 136282 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 57.

The spelling of 19951611485520 in words is "nineteen trillion, nine hundred fifty-one billion, six hundred eleven million, four hundred eighty-five thousand, five hundred twenty".