645166210222641 has 8 divisors (see below), whose sum is σ = 860223423340864. Its totient is φ = 430109901959760.

The previous prime is 645166210222627. The next prime is 645166210222741. The reversal of 645166210222641 is 146222012661546.

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

It is not a de Polignac number, because 645166210222641 - 2¹¹ = 645166210220593 is a prime.

It is a super-3 number, since 3×645166210222641³ (a number of 45 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645166210222621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224548405 + ... + 227403426.

It is an arithmetic number, because the mean of its divisors is an integer number (107527927917608).

Almost surely, 2^{645166210222641} is an apocalyptic number.

It is an amenable number.

645166210222641 is a deficient number, since it is larger than the sum of its proper divisors (215057213118223).

645166210222641 is a wasteful number, since it uses less digits than its factorization.

645166210222641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452427671.

The product of its (nonzero) digits is 1658880, while the sum is 48.

The spelling of 645166210222641 in words is "six hundred forty-five trillion, one hundred sixty-six billion, two hundred ten million, two hundred twenty-two thousand, six hundred forty-one".