19438508538550 has 24 divisors (see below), whose sum is σ = 36231107400000. Its totient is φ = 7759170830880.

The previous prime is 19438508538541. The next prime is 19438508538623. The reversal of 19438508538550 is 5583580583491.

It is a super-2 number, since 2×19438508538550² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 405790425 + ... + 405838324.

It is an arithmetic number, because the mean of its divisors is an integer number (1509629475000).

Almost surely, 2^{19438508538550} is an apocalyptic number.

19438508538550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19438508538550 is a deficient number, since it is larger than the sum of its proper divisors (16792598861450).

19438508538550 is a wasteful number, since it uses less digits than its factorization.

19438508538550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811629240 (or 811629235 counting only the distinct ones).

The product of its (nonzero) digits is 103680000, while the sum is 64.

The spelling of 19438508538550 in words is "nineteen trillion, four hundred thirty-eight billion, five hundred eight million, five hundred thirty-eight thousand, five hundred fifty".