66400562587 has 2 divisors, whose sum is σ = 66400562588. Its totient is φ = 66400562586.

The previous prime is 66400562537. The next prime is 66400562611. The reversal of 66400562587 is 78526500466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66400562587 - 2²³ = 66392173979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66400562587.

It is not a weakly prime, because it can be changed into another prime (66400562537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33200281293 + 33200281294.

It is an arithmetic number, because the mean of its divisors is an integer number (33200281294).

Almost surely, 2^66400562587 is an apocalyptic number.

66400562587 is a deficient number, since it is larger than the sum of its proper divisors (1).

66400562587 is an equidigital number, since it uses as much as digits as its factorization.

66400562587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2419200, while the sum is 49.

The spelling of 66400562587 in words is "sixty-six billion, four hundred million, five hundred sixty-two thousand, five hundred eighty-seven".