66229987 has 2 divisors, whose sum is σ = 66229988. Its totient is φ = 66229986.

The previous prime is 66229967. The next prime is 66230009. The reversal of 66229987 is 78992266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66229987 - 2¹⁹ = 65705699 is a prime.

It is a super-2 number, since 2×66229987² = 8772822356040338, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66229987.

It is not a weakly prime, because it can be changed into another prime (66229937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33114993 + 33114994.

It is an arithmetic number, because the mean of its divisors is an integer number (33114994).

Almost surely, 2^66229987 is an apocalyptic number.

66229987 is a deficient number, since it is larger than the sum of its proper divisors (1).

66229987 is an equidigital number, since it uses as much as digits as its factorization.

66229987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The square root of 66229987 is about 8138.1808163741. The cubic root of 66229987 is about 404.5928683101.

The spelling of 66229987 in words is "sixty-six million, two hundred twenty-nine thousand, nine hundred eighty-seven".