66404744054471 has 32 divisors (see below), whose sum is σ = 73628483414400. Its totient is φ = 59661826076160.

The previous prime is 66404744054443. The next prime is 66404744054513. The reversal of 66404744054471 is 17445044740466.

It is a cyclic number.

It is not a de Polignac number, because 66404744054471 - 2¹⁸ = 66404743792327 is a prime.

It is a super-3 number, since 3×66404744054471³ (a number of 42 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66404744014471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 187902125 + ... + 188255193.

It is an arithmetic number, because the mean of its divisors is an integer number (2300890106700).

Almost surely, 2^{66404744054471} is an apocalyptic number.

66404744054471 is a deficient number, since it is larger than the sum of its proper divisors (7223739359929).

66404744054471 is a wasteful number, since it uses less digits than its factorization.

66404744054471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360779.

The product of its (nonzero) digits is 36126720, while the sum is 56.

The spelling of 66404744054471 in words is "sixty-six trillion, four hundred four billion, seven hundred forty-four million, fifty-four thousand, four hundred seventy-one".