66253406720774 has 16 divisors (see below), whose sum is σ = 122313981638688. Its totient is φ = 26210138922432.

The previous prime is 66253406720747. The next prime is 66253406720801. The reversal of 66253406720774 is 47702760435266.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66253406720747) and next prime (66253406720801).

It is a Curzon number.

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, 182014853447 + ... + 182014853810.

It is an arithmetic number, because the mean of its divisors is an integer number (7644623852418).

Almost surely, 2^{66253406720774} is an apocalyptic number.

66253406720774 is a deficient number, since it is larger than the sum of its proper divisors (56060574917914).

66253406720774 is a wasteful number, since it uses less digits than its factorization.

66253406720774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364029707279.

The product of its (nonzero) digits is 71124480, while the sum is 59.

The spelling of 66253406720774 in words is "sixty-six trillion, two hundred fifty-three billion, four hundred six million, seven hundred twenty thousand, seven hundred seventy-four".