66707402 has 4 divisors (see below), whose sum is σ = 100061106. Its totient is φ = 33353700.

The previous prime is 66707359. The next prime is 66707413. The reversal of 66707402 is 20470766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20470766 = 2 ⋅10235383.

It can be written as a sum of positive squares in only one way, i.e., 64176121 + 2531281 = 8011^2 + 1591^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16676849 + ... + 16676852.

Almost surely, 2^66707402 is an apocalyptic number.

66707402 is a deficient number, since it is larger than the sum of its proper divisors (33353704).

66707402 is a wasteful number, since it uses less digits than its factorization.

66707402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33353703.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 66707402 is about 8167.4599478663. The cubic root of 66707402 is about 405.5627030648.

The spelling of 66707402 in words is "sixty-six million, seven hundred seven thousand, four hundred two".