1999377844560 has 160 divisors (see below), whose sum is σ = 6887682552960. Its totient is φ = 533094912000.

The previous prime is 1999377844559. The next prime is 1999377844571. The reversal of 1999377844560 is 654487739991.

1999377844560 is a `hidden beast` number, since 1 + 9 + 9 + 93 + 7 + 7 + 84 + 456 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16877535 + ... + 16995585.

It is an arithmetic number, because the mean of its divisors is an integer number (43048015956).

Almost surely, 2^{1999377844560} is an apocalyptic number.

1999377844560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1999377844560 is an abundant number, since it is smaller than the sum of its proper divisors (4888304708400).

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

1999377844560 is a wasteful number, since it uses less digits than its factorization.

1999377844560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125914 (or 125902 counting only the distinct ones).

The product of its (nonzero) digits is 411505920, while the sum is 72.

The spelling of 1999377844560 in words is "one trillion, nine hundred ninety-nine billion, three hundred seventy-seven million, eight hundred forty-four thousand, five hundred sixty".