16291857787900 has 72 divisors (see below), whose sum is σ = 35601646348800. Its totient is φ = 6471101039040.

The previous prime is 16291857787889. The next prime is 16291857787921. The reversal of 16291857787900 is 978775819261.

It is a Smith number, since the sum of its digits (70) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 16291857787900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9195897 + ... + 10823503.

It is an arithmetic number, because the mean of its divisors is an integer number (494467310400).

Almost surely, 2^{16291857787900} is an apocalyptic number.

16291857787900 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 16291857787900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17800823174400).

16291857787900 is an abundant number, since it is smaller than the sum of its proper divisors (19309788560900).

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

16291857787900 is a wasteful number, since it uses less digits than its factorization.

16291857787900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1628323 (or 1628316 counting only the distinct ones).

The product of its (nonzero) digits is 106686720, while the sum is 70.

The spelling of 16291857787900 in words is "sixteen trillion, two hundred ninety-one billion, eight hundred fifty-seven million, seven hundred eighty-seven thousand, nine hundred".