19649493017940 has 48 divisors (see below), whose sum is σ = 55019815824960. Its totient is φ = 5239747150080.

The previous prime is 19649493017933. The next prime is 19649493018013. The reversal of 19649493017940 is 4971039494691.

It is a super-2 number, since 2×19649493017940² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 965766 + ... + 6342845.

It is an arithmetic number, because the mean of its divisors is an integer number (1146246163020).

Almost surely, 2^{19649493017940} is an apocalyptic number.

19649493017940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19649493017940 is an abundant number, since it is smaller than the sum of its proper divisors (35370322807020).

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

19649493017940 is a wasteful number, since it uses less digits than its factorization.

19649493017940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7353432 (or 7353430 counting only the distinct ones).

The product of its (nonzero) digits is 52907904, while the sum is 66.

The spelling of 19649493017940 in words is "nineteen trillion, six hundred forty-nine billion, four hundred ninety-three million, seventeen thousand, nine hundred forty".