66393440356319 has 16 divisors (see below), whose sum is σ = 70070985900000. Its totient is φ = 62734320230400.

The previous prime is 66393440356303. The next prime is 66393440356349. The reversal of 66393440356319 is 91365304439366.

It is not a de Polignac number, because 66393440356319 - 2⁴ = 66393440356303 is a prime.

It is a super-2 number, since 2×66393440356319² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66393440356349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20218919 + ... + 23272119.

It is an arithmetic number, because the mean of its divisors is an integer number (4379436618750).

Almost surely, 2^{66393440356319} is an apocalyptic number.

66393440356319 is a deficient number, since it is larger than the sum of its proper divisors (3677545543681).

66393440356319 is a wasteful number, since it uses less digits than its factorization.

66393440356319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3056218.

The product of its (nonzero) digits is 113374080, while the sum is 62.

The spelling of 66393440356319 in words is "sixty-six trillion, three hundred ninety-three billion, four hundred forty million, three hundred fifty-six thousand, three hundred nineteen".