66507406 has 12 divisors (see below), whose sum is σ = 116048808. Its totient is φ = 28503132.

The previous prime is 66507403. The next prime is 66507407. The reversal of 66507406 is 60470566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66507401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 339226 + ... + 339421.

It is an arithmetic number, because the mean of its divisors is an integer number (9670734).

Almost surely, 2^66507406 is an apocalyptic number.

66507406 is a deficient number, since it is larger than the sum of its proper divisors (49541402).

66507406 is a wasteful number, since it uses less digits than its factorization.

66507406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678663 (or 678656 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 66507406 is about 8155.2072935027. The cubic root of 66507406 is about 405.1569904004.

The spelling of 66507406 in words is "sixty-six million, five hundred seven thousand, four hundred six".