42666901 has 2 divisors, whose sum is σ = 42666902. Its totient is φ = 42666900.

The previous prime is 42666887. The next prime is 42666907. The reversal of 42666901 is 10966624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37822500 + 4844401 = 6150^2 + 2201^2 .

It is a cyclic number.

It is not a de Polignac number, because 42666901 - 2¹⁵ = 42634133 is a prime.

It is equal to p_2585680 and since 42666901 and 2585680 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42666907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21333450 + 21333451.

It is an arithmetic number, because the mean of its divisors is an integer number (21333451).

Almost surely, 2^42666901 is an apocalyptic number.

It is an amenable number.

42666901 is a deficient number, since it is larger than the sum of its proper divisors (1).

42666901 is an equidigital number, since it uses as much as digits as its factorization.

42666901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 42666901 is about 6531.9905848064. The cubic root of 42666901 is about 349.4328256090.

The spelling of 42666901 in words is "forty-two million, six hundred sixty-six thousand, nine hundred one".