645665383177 has 8 divisors (see below), whose sum is σ = 646401943296. Its totient is φ = 644928987072.

The previous prime is 645665383151. The next prime is 645665383199. The reversal of 645665383177 is 771383566546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645665383177 - 2⁷ = 645665383049 is a prime.

It is a super-2 number, since 2×645665383177² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645665383277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8945728 + ... + 9017614.

It is an arithmetic number, because the mean of its divisors is an integer number (80800242912).

Almost surely, 2^645665383177 is an apocalyptic number.

It is an amenable number.

645665383177 is a deficient number, since it is larger than the sum of its proper divisors (736560119).

645665383177 is an equidigital number, since it uses as much as digits as its factorization.

645665383177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82007.

The product of its digits is 76204800, while the sum is 61.

The spelling of 645665383177 in words is "six hundred forty-five billion, six hundred sixty-five million, three hundred eighty-three thousand, one hundred seventy-seven".