66204552615646 has 16 divisors (see below), whose sum is σ = 101503803247344. Its totient is φ = 32373942404544.

The previous prime is 66204552615631. The next prime is 66204552615659. The reversal of 66204552615646 is 64651625540266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 997684476 + ... + 997750831.

It is an arithmetic number, because the mean of its divisors is an integer number (6343987702959).

Almost surely, 2^{66204552615646} is an apocalyptic number.

66204552615646 is a deficient number, since it is larger than the sum of its proper divisors (35299250631698).

66204552615646 is a wasteful number, since it uses less digits than its factorization.

66204552615646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995435675.

The product of its (nonzero) digits is 62208000, while the sum is 58.

The spelling of 66204552615646 in words is "sixty-six trillion, two hundred four billion, five hundred fifty-two million, six hundred fifteen thousand, six hundred forty-six".