66999996 has 36 divisors (see below), whose sum is σ = 193556272. Its totient is φ = 19142784.

The previous prime is 66999983. The next prime is 66999997. The reversal of 66999996 is 69999966.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66999997) 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, 132685 + ... + 133188.

Almost surely, 2^66999996 is an apocalyptic number.

It is an amenable number.

66999996 is an abundant number, since it is smaller than the sum of its proper divisors (126556276).

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

66999996 is a wasteful number, since it uses less digits than its factorization.

66999996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265890 (or 265885 counting only the distinct ones).

The product of its digits is 12754584, while the sum is 63.

The square root of 66999996 is about 8185.3525275336. The cubic root of 66999996 is about 406.1548019619.

The spelling of 66999996 in words is "sixty-six million, nine hundred ninety-nine thousand, nine hundred ninety-six".