66666430 has 32 divisors (see below), whose sum is σ = 125411328. Its totient is φ = 25485600.

The previous prime is 66666427. The next prime is 66666433. The reversal of 66666430 is 3466666.

It is an interprime number because it is at equal distance from previous prime (66666427) and next prime (66666433).

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 66666430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24435 + ... + 27025.

It is an arithmetic number, because the mean of its divisors is an integer number (3919104).

Almost surely, 2^66666430 is an apocalyptic number.

66666430 is a deficient number, since it is larger than the sum of its proper divisors (58744898).

66666430 is a wasteful number, since it uses less digits than its factorization.

66666430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2712.

The product of its (nonzero) digits is 93312, while the sum is 37.

The square root of 66666430 is about 8164.9513164501. The cubic root of 66666430 is about 405.4796532195.

The spelling of 66666430 in words is "sixty-six million, six hundred sixty-six thousand, four hundred thirty".