666754303457665 has 16 divisors (see below), whose sum is σ = 817179313616640. Its totient is φ = 522022082992000.

The previous prime is 666754303457629. The next prime is 666754303457699. The reversal of 666754303457665 is 566754303457666.

666754303457665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 666754303457665 - 2¹³ = 666754303449473 is a prime.

It is a super-2 number, since 2×666754303457665² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84107836 + ... + 91693165.

It is an arithmetic number, because the mean of its divisors is an integer number (51073707101040).

Almost surely, 2^{666754303457665} is an apocalyptic number.

It is an amenable number.

666754303457665 is a deficient number, since it is larger than the sum of its proper divisors (150425010158975).

666754303457665 is a wasteful number, since it uses less digits than its factorization.

666754303457665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175817192.

The product of its (nonzero) digits is 6858432000, while the sum is 73.

Subtracting from 666754303457665 its reverse (566754303457666), we obtain a palindrome (99999999999999).

The spelling of 666754303457665 in words is "six hundred sixty-six trillion, seven hundred fifty-four billion, three hundred three million, four hundred fifty-seven thousand, six hundred sixty-five".