19966099 has 6 divisors (see below), whose sum is σ = 20162940. Its totient is φ = 19770156.

The previous prime is 19966091. The next prime is 19966129. The reversal of 19966099 is 99066991.

It is a happy number.

It is not a de Polignac number, because 19966099 - 2³ = 19966091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19966091) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52492 + ... + 52870.

It is an arithmetic number, because the mean of its divisors is an integer number (3360490).

Almost surely, 2^19966099 is an apocalyptic number.

19966099 is a deficient number, since it is larger than the sum of its proper divisors (196841).

19966099 is an frugal number, since it uses more digits than its factorization.

19966099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 49.

The square root of 19966099 is about 4468.3441004471. The cubic root of 19966099 is about 271.2883058023.

The spelling of 19966099 in words is "nineteen million, nine hundred sixty-six thousand, ninety-nine".