66869509966 has 16 divisors (see below), whose sum is σ = 114863184000. Its totient is φ = 28600926840.

The previous prime is 66869509963. The next prime is 66869510011. The reversal of 66869509966 is 66990596866.

It is a super-3 number, since 3×66869509966³ (a number of 33 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66869509895 and 66869509904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66869509963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4778980 + ... + 4792951.

It is an arithmetic number, because the mean of its divisors is an integer number (7178949000).

Almost surely, 2^66869509966 is an apocalyptic number.

66869509966 is a deficient number, since it is larger than the sum of its proper divisors (47993674034).

66869509966 is a wasteful number, since it uses less digits than its factorization.

66869509966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9572439.

The product of its (nonzero) digits is 226748160, while the sum is 70.

The spelling of 66869509966 in words is "sixty-six billion, eight hundred sixty-nine million, five hundred nine thousand, nine hundred sixty-six".