42664651 has 2 divisors, whose sum is σ = 42664652. Its totient is φ = 42664650.

The previous prime is 42664603. The next prime is 42664667. The reversal of 42664651 is 15646624.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42664651 is a prime.

It is not a weakly prime, because it can be changed into another prime (42664451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21332325 + 21332326.

It is an arithmetic number, because the mean of its divisors is an integer number (21332326).

Almost surely, 2^42664651 is an apocalyptic number.

42664651 is a deficient number, since it is larger than the sum of its proper divisors (1).

42664651 is an equidigital number, since it uses as much as digits as its factorization.

42664651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 34.

The square root of 42664651 is about 6531.8183532612. The cubic root of 42664651 is about 349.4266831609.

The spelling of 42664651 in words is "forty-two million, six hundred sixty-four thousand, six hundred fifty-one".