17920969550 has 24 divisors (see below), whose sum is σ = 36363277512. Its totient is φ = 6516716000.

The previous prime is 17920969529. The next prime is 17920969597. The reversal of 17920969550 is 5596902971.

It is a happy number.

It is a super-2 number, since 2×17920969550² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 17920969492 and 17920969501.

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, 16291241 + ... + 16292340.

It is an arithmetic number, because the mean of its divisors is an integer number (1515136563).

Almost surely, 2^17920969550 is an apocalyptic number.

17920969550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

17920969550 is an abundant number, since it is smaller than the sum of its proper divisors (18442307962).

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

17920969550 is a wasteful number, since it uses less digits than its factorization.

17920969550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32583604 (or 32583599 counting only the distinct ones).

The product of its (nonzero) digits is 1530900, while the sum is 53.

The spelling of 17920969550 in words is "seventeen billion, nine hundred twenty million, nine hundred sixty-nine thousand, five hundred fifty".