66426487 has 2 divisors, whose sum is σ = 66426488. Its totient is φ = 66426486.

The previous prime is 66426467. The next prime is 66426491. The reversal of 66426487 is 78462466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66426487 is a prime.

It is a super-2 number, since 2×66426487² = 8824956350322338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66426427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33213243 + 33213244.

It is an arithmetic number, because the mean of its divisors is an integer number (33213244).

Almost surely, 2^66426487 is an apocalyptic number.

66426487 is a deficient number, since it is larger than the sum of its proper divisors (1).

66426487 is an equidigital number, since it uses as much as digits as its factorization.

66426487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 43.

The square root of 66426487 is about 8150.2445975566. The cubic root of 66426487 is about 404.9926066831.

The spelling of 66426487 in words is "sixty-six million, four hundred twenty-six thousand, four hundred eighty-seven".