66404646045 has 80 divisors (see below), whose sum is σ = 120161828160. Its totient is φ = 35082028800.

The previous prime is 66404646019. The next prime is 66404646137. The reversal of 66404646045 is 54064640466.

It is not a de Polignac number, because 66404646045 - 2⁹ = 66404645533 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 51515761 + ... + 51517049.

It is an arithmetic number, because the mean of its divisors is an integer number (1502022852).

Almost surely, 2^66404646045 is an apocalyptic number.

It is an amenable number.

66404646045 is a deficient number, since it is larger than the sum of its proper divisors (53757182115).

66404646045 is a wasteful number, since it uses less digits than its factorization.

66404646045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408 (or 2399 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 45.

The spelling of 66404646045 in words is "sixty-six billion, four hundred four million, six hundred forty-six thousand, forty-five".