66299960 has 32 divisors (see below), whose sum is σ = 151070400. Its totient is φ = 26183040.

The previous prime is 66299957. The next prime is 66299963. The reversal of 66299960 is 6999266.

It is an interprime number because it is at equal distance from previous prime (66299957) and next prime (66299963).

It is a Smith number, since the sum of its digits (47) 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 (66299963) 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, 7331 + ... + 13650.

It is an arithmetic number, because the mean of its divisors is an integer number (4720950).

Almost surely, 2^66299960 is an apocalyptic number.

It is an amenable number.

66299960 is an abundant number, since it is smaller than the sum of its proper divisors (84770440).

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

66299960 is a wasteful number, since it uses less digits than its factorization.

66299960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21071 (or 21067 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 66299960 is about 8142.4787380748. The cubic root of 66299960 is about 404.7353043561.

The spelling of 66299960 in words is "sixty-six million, two hundred ninety-nine thousand, nine hundred sixty".