66640430 has 16 divisors (see below), whose sum is σ = 125168544. Its totient is φ = 25497120.

The previous prime is 66640423. The next prime is 66640481. The reversal of 66640430 is 3404666.

It is a junction number, because it is equal to n+sod(n) for n = 66640393 and 66640402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144641 + ... + 145100.

It is an arithmetic number, because the mean of its divisors is an integer number (7823034).

Almost surely, 2^66640430 is an apocalyptic number.

66640430 is a deficient number, since it is larger than the sum of its proper divisors (58528114).

66640430 is a wasteful number, since it uses less digits than its factorization.

66640430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289771.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 66640430 is about 8163.3589900237. The cubic root of 66640430 is about 405.4269338233.

The spelling of 66640430 in words is "sixty-six million, six hundred forty thousand, four hundred thirty".