19491396041040 has 1280 divisors, whose sum is σ = 79396086325248. Its totient is φ = 3839016960000.

The previous prime is 19491396041021. The next prime is 19491396041053. The reversal of 19491396041040 is 4014069319491.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 3836131300 + ... + 3836136380.

Almost surely, 2^{19491396041040} is an apocalyptic number.

19491396041040 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 19491396041040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39698043162624).

19491396041040 is an abundant number, since it is smaller than the sum of its proper divisors (59904690284208).

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

19491396041040 is a wasteful number, since it uses less digits than its factorization.

19491396041040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300 (or 5294 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 51.

The spelling of 19491396041040 in words is "nineteen trillion, four hundred ninety-one billion, three hundred ninety-six million, forty-one thousand, forty".