645454323111 has 8 divisors (see below), whose sum is σ = 926806207600. Its totient is φ = 397202660352.

The previous prime is 645454323077. The next prime is 645454323121. The reversal of 645454323111 is 111323454546.

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

It is not a de Polignac number, because 645454323111 - 2¹⁰ = 645454322087 is a prime.

It is a super-2 number, since 2×645454323111² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 16550110849 = 645454323111 / (6 + 4 + 5 + 4 + 5 + 4 + 3 + 2 + 3 + 1 + 1 + 1).

It is a self number, because there is not a number n which added to its sum of digits gives 645454323111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645454323121) 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, 8275055386 + ... + 8275055463.

It is an arithmetic number, because the mean of its divisors is an integer number (115850775950).

Almost surely, 2^645454323111 is an apocalyptic number.

645454323111 is a deficient number, since it is larger than the sum of its proper divisors (281351884489).

645454323111 is a wasteful number, since it uses less digits than its factorization.

645454323111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16550110865.

The product of its digits is 172800, while the sum is 39.

Adding to 645454323111 its reverse (111323454546), we get a palindrome (756777777657).

The spelling of 645454323111 in words is "six hundred forty-five billion, four hundred fifty-four million, three hundred twenty-three thousand, one hundred eleven".