191749720000 has 140 divisors (see below), whose sum is σ = 476618133376. Its totient is φ = 76515840000.

The previous prime is 191749719977. The next prime is 191749720003. The reversal of 191749720000 is 27947191.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191749720003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17314465 + ... + 17325535.

Almost surely, 2^191749720000 is an apocalyptic number.

191749720000 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 191749720000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238309066688).

191749720000 is an abundant number, since it is smaller than the sum of its proper divisors (284868413376).

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

191749720000 is an equidigital number, since it uses as much as digits as its factorization.

191749720000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11536 (or 11511 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 40.

The spelling of 191749720000 in words is "one hundred ninety-one billion, seven hundred forty-nine million, seven hundred twenty thousand".