19121223551688 has 48 divisors (see below), whose sum is σ = 51797466236880. Its totient is φ = 6372409600224.

The previous prime is 19121223551669. The next prime is 19121223551723. The reversal of 19121223551688 is 88615532212191.

It is a happy number.

19121223551688 is a `hidden beast` number, since 1 + 9 + 1 + 2 + 1 + 2 + 2 + 3 + 551 + 6 + 88 = 666.

It is a super-2 number, since 2×19121223551688² (a number of 27 digits) contains 22 as substring.

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, 27394270 + ... + 28083597.

It is an arithmetic number, because the mean of its divisors is an integer number (1079113879935).

Almost surely, 2^{19121223551688} is an apocalyptic number.

19121223551688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19121223551688 is an abundant number, since it is smaller than the sum of its proper divisors (32676242685192).

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

19121223551688 is a wasteful number, since it uses less digits than its factorization.

19121223551688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55482666 (or 55482659 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 54.

The spelling of 19121223551688 in words is "nineteen trillion, one hundred twenty-one billion, two hundred twenty-three million, five hundred fifty-one thousand, six hundred eighty-eight".