66507478 has 4 divisors (see below), whose sum is σ = 99761220. Its totient is φ = 33253738.

The previous prime is 66507473. The next prime is 66507479. The reversal of 66507478 is 87470566.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66507473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16626868 + ... + 16626871.

It is an arithmetic number, because the mean of its divisors is an integer number (24940305).

Almost surely, 2^66507478 is an apocalyptic number.

66507478 is a deficient number, since it is larger than the sum of its proper divisors (33253742).

66507478 is a wasteful number, since it uses less digits than its factorization.

66507478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33253741.

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 66507478 is about 8155.2117078590. The cubic root of 66507478 is about 405.1571366061.

The spelling of 66507478 in words is "sixty-six million, five hundred seven thousand, four hundred seventy-eight".