66243402 has 24 divisors (see below), whose sum is σ = 144071460. Its totient is φ = 21997440.

The previous prime is 66243383. The next prime is 66243421. The reversal of 66243402 is 20434266.

66243402 is a `hidden beast` number, since 6 + 624 + 34 + 0 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (66243383) and next prime (66243421).

It can be written as a sum of positive squares in 2 ways, for example, as 66243321 + 81 = 8139^2 + 9^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1999 + ... + 11682.

Almost surely, 2^66243402 is an apocalyptic number.

66243402 is an abundant number, since it is smaller than the sum of its proper divisors (77828058).

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

66243402 is a wasteful number, since it uses less digits than its factorization.

66243402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13958 (or 13955 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 66243402 is about 8139.0049760398. The cubic root of 66243402 is about 404.6201834642.

Adding to 66243402 its reverse (20434266), we get a palindrome (86677668).

The spelling of 66243402 in words is "sixty-six million, two hundred forty-three thousand, four hundred two".