66699160 has 128 divisors (see below), whose sum is σ = 178770240. Its totient is φ = 22118400.

The previous prime is 66699137. The next prime is 66699161. The reversal of 66699160 is 6199666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66699161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 276640 + ... + 276880.

Almost surely, 2^66699160 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66699160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89385120).

66699160 is an abundant number, since it is smaller than the sum of its proper divisors (112071080).

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

66699160 is a wasteful number, since it uses less digits than its factorization.

66699160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 66699160 is about 8166.9553690467. The cubic root of 66699160 is about 405.5459993439.

The spelling of 66699160 in words is "sixty-six million, six hundred ninety-nine thousand, one hundred sixty".