66599730 has 48 divisors (see below), whose sum is σ = 173660760. Its totient is φ = 17708544.

The previous prime is 66599723. The next prime is 66599737. The reversal of 66599730 is 3799566.

It is an interprime number because it is at equal distance from previous prime (66599723) and next prime (66599737).

It can be written as a sum of positive squares in 4 ways, for example, as 28740321 + 37859409 = 5361^2 + 6153^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66599737) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38116 + ... + 39824.

Almost surely, 2^66599730 is an apocalyptic number.

66599730 is an abundant number, since it is smaller than the sum of its proper divisors (107061030).

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

66599730 is a wasteful number, since it uses less digits than its factorization.

66599730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155 (or 2152 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 45.

The square root of 66599730 is about 8160.8657628955. The cubic root of 66599730 is about 405.3443801513.

The spelling of 66599730 in words is "sixty-six million, five hundred ninety-nine thousand, seven hundred thirty".