9966551 has 12 divisors (see below), whose sum is σ = 11647152.
Its totient is φ = 8528352.
The previous prime is 9966547. The next prime is 9966559. The reversal of 9966551 is 1556699.
9966551 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.
It is not a de Polignac number, because 9966551 - 22 = 9966547 is a prime.
It is a Duffinian number.
It is a nialpdrome in base 10.
It is a junction number, because it is equal to n+sod(n) for n = 9966499 and 9966508.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (9966559) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16511 + ... + 17103.
It is an arithmetic number, because the mean of its divisors is an integer number (970596).
Almost surely, 29966551 is an apocalyptic number.
9966551 is a deficient number, since it is larger than the sum of its proper divisors (1680601).
9966551 is an frugal number, since it uses more digits than its factorization.
9966551 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 628 (or 600 counting only the distinct ones).
The product of its digits is 72900, while the sum is 41.
The square root of 9966551 is about 3156.9844788975.
The cubic root of 9966551 is about 215.2029883892.
The spelling of 9966551 in words is "nine million, nine hundred sixty-six thousand, five hundred fifty-one".