66523487 has 2 divisors, whose sum is σ = 66523488. Its totient is φ = 66523486.

The previous prime is 66523469. The next prime is 66523493. The reversal of 66523487 is 78432566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66523487 - 2⁶ = 66523423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66523087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33261743 + 33261744.

It is an arithmetic number, because the mean of its divisors is an integer number (33261744).

Almost surely, 2^66523487 is an apocalyptic number.

66523487 is a deficient number, since it is larger than the sum of its proper divisors (1).

66523487 is an equidigital number, since it uses as much as digits as its factorization.

66523487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 41.

The square root of 66523487 is about 8156.1931683844. The cubic root of 66523487 is about 405.1896424257.

The spelling of 66523487 in words is "sixty-six million, five hundred twenty-three thousand, four hundred eighty-seven".