1999949952640 has 48 divisors (see below), whose sum is σ = 4781215885590. Its totient is φ = 799965670400.

The previous prime is 1999949952629. The next prime is 1999949952643. The reversal of 1999949952640 is 462599499991.

It can be written as a sum of positive squares in 3 ways, for example, as 1979468908096 + 20481044544 = 1406936^2 + 143112^2 .

It is not an unprimeable number, because it can be changed into a prime (1999949952643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35748690 + ... + 35804590.

Almost surely, 2^{1999949952640} is an apocalyptic number.

1999949952640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1999949952640 is an abundant number, since it is smaller than the sum of its proper divisors (2781265932950).

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

1999949952640 is an frugal number, since it uses more digits than its factorization.

1999949952640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111821 (or 55908 counting only the distinct ones).

The product of its (nonzero) digits is 510183360, while the sum is 76.

The spelling of 1999949952640 in words is "one trillion, nine hundred ninety-nine billion, nine hundred forty-nine million, nine hundred fifty-two thousand, six hundred forty".