66306934410649 has 3 divisors (see below), whose sum is σ = 66306942553557. Its totient is φ = 66306926267742.

The previous prime is 66306934410601. The next prime is 66306934410677. The reversal of 66306934410649 is 94601443960366.

The square root of 66306934410649 is 8142907.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 66306934410649 - 2⁹ = 66306934410137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66306934410149) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4071454 + ... + 12214360.

It is an arithmetic number, because the mean of its divisors is an integer number (22102314184519).

Almost surely, 2^{66306934410649} is an apocalyptic number.

66306934410649 is the 8142907-th square number.

66306934410649 is the 4071454-th centered octagonal number.

It is an amenable number.

66306934410649 is a deficient number, since it is larger than the sum of its proper divisors (8142908).

66306934410649 is an frugal number, since it uses more digits than its factorization.

66306934410649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16285814 (or 8142907 counting only the distinct ones).

The product of its (nonzero) digits is 60466176, while the sum is 61.

The spelling of 66306934410649 in words is "sixty-six trillion, three hundred six billion, nine hundred thirty-four million, four hundred ten thousand, six hundred forty-nine".