66099942 has 32 divisors (see below), whose sum is σ = 149385600. Its totient is φ = 21658824.

The previous prime is 66099919. The next prime is 66099949. The reversal of 66099942 is 24999066.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66099949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7188 + ... + 13559.

It is an arithmetic number, because the mean of its divisors is an integer number (4668300).

Almost surely, 2^66099942 is an apocalyptic number.

66099942 is an abundant number, since it is smaller than the sum of its proper divisors (83285658).

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

66099942 is a wasteful number, since it uses less digits than its factorization.

66099942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20817 (or 20811 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 66099942 is about 8130.1870827183. The cubic root of 66099942 is about 404.3278838375.

The spelling of 66099942 in words is "sixty-six million, ninety-nine thousand, nine hundred forty-two".