1919194945920 has 768 divisors, whose sum is σ = 7670816225280. Its totient is φ = 433091543040.

The previous prime is 1919194945883. The next prime is 1919194945991. The reversal of 1919194945920 is 295494919191.

It is a happy number.

1919194945920 is a `hidden beast` number, since 1 + 9 + 1 + 91 + 9 + 494 + 59 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2163691717 + ... + 2163692603.

It is an arithmetic number, because the mean of its divisors is an integer number (9988041960).

Almost surely, 2^{1919194945920} is an apocalyptic number.

1919194945920 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 1919194945920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3835408112640).

1919194945920 is an abundant number, since it is smaller than the sum of its proper divisors (5751621279360).

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

1919194945920 is a wasteful number, since it uses less digits than its factorization.

1919194945920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543 (or 1528 counting only the distinct ones).

The product of its (nonzero) digits is 9447840, while the sum is 63.

The spelling of 1919194945920 in words is "one trillion, nine hundred nineteen billion, one hundred ninety-four million, nine hundred forty-five thousand, nine hundred twenty".