66053987 has 2 divisors, whose sum is σ = 66053988. Its totient is φ = 66053986.

The previous prime is 66053983. The next prime is 66054017. The reversal of 66053987 is 78935066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66053987 - 2² = 66053983 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66053983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33026993 + 33026994.

It is an arithmetic number, because the mean of its divisors is an integer number (33026994).

Almost surely, 2^66053987 is an apocalyptic number.

66053987 is a deficient number, since it is larger than the sum of its proper divisors (1).

66053987 is an equidigital number, since it uses as much as digits as its factorization.

66053987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 66053987 is about 8127.3603956020. The cubic root of 66053987 is about 404.2341611351.

The spelling of 66053987 in words is "sixty-six million, fifty-three thousand, nine hundred eighty-seven".