66380636505 has 16 divisors (see below), whose sum is σ = 109635116544. Its totient is φ = 34260973440.

The previous prime is 66380636501. The next prime is 66380636507. The reversal of 66380636505 is 50563608366.

It is not a de Polignac number, because 66380636505 - 2² = 66380636501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66380636501) 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 in 15 ways as a sum of consecutive naturals, for example, 71376564 + ... + 71377493.

It is an arithmetic number, because the mean of its divisors is an integer number (6852194784).

Almost surely, 2^66380636505 is an apocalyptic number.

It is an amenable number.

66380636505 is a deficient number, since it is larger than the sum of its proper divisors (43254480039).

66380636505 is a wasteful number, since it uses less digits than its factorization.

66380636505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142754096.

The product of its (nonzero) digits is 2332800, while the sum is 48.

The spelling of 66380636505 in words is "sixty-six billion, three hundred eighty million, six hundred thirty-six thousand, five hundred five".