19649620861388 has 48 divisors (see below), whose sum is σ = 42247785108480. Its totient is φ = 7808295977856.

The previous prime is 19649620861357. The next prime is 19649620861393. The reversal of 19649620861388 is 88316802694691.

It is a super-2 number, since 2×19649620861388² (a number of 27 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 392904545 + ... + 392954552.

It is an arithmetic number, because the mean of its divisors is an integer number (880162189760).

Almost surely, 2^{19649620861388} is an apocalyptic number.

It is an amenable number.

19649620861388 is an abundant number, since it is smaller than the sum of its proper divisors (22598164247092).

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

19649620861388 is a wasteful number, since it uses less digits than its factorization.

19649620861388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785859174 (or 785859172 counting only the distinct ones).

The product of its (nonzero) digits is 214990848, while the sum is 71.

The spelling of 19649620861388 in words is "nineteen trillion, six hundred forty-nine billion, six hundred twenty million, eight hundred sixty-one thousand, three hundred eighty-eight".