66813341406752 has 24 divisors (see below), whose sum is σ = 131539067559900. Its totient is φ = 33406594089984.

The previous prime is 66813341406709. The next prime is 66813341406769. The reversal of 66813341406752 is 25760414331866.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 58196087220496 + 8617254186256 = 7628636^2 + 2935516^2 .

It is a super-2 number, since 2×66813341406752² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13375124 + ... + 17678252.

Almost surely, 2^{66813341406752} is an apocalyptic number.

It is an amenable number.

66813341406752 is a deficient number, since it is larger than the sum of its proper divisors (64725726153148).

66813341406752 is a wasteful number, since it uses less digits than its factorization.

66813341406752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4788348 (or 4788340 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 56.

The spelling of 66813341406752 in words is "sixty-six trillion, eight hundred thirteen billion, three hundred forty-one million, four hundred six thousand, seven hundred fifty-two".