645511011 has 8 divisors (see below), whose sum is σ = 881673744. Its totient is φ = 419844480.

The previous prime is 645510989. The next prime is 645511021. The reversal of 645511011 is 110115546.

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

It is not a de Polignac number, because 645511011 - 2⁹ = 645510499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645511021) 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, 2623906 + ... + 2624151.

It is an arithmetic number, because the mean of its divisors is an integer number (110209218).

Almost surely, 2^645511011 is an apocalyptic number.

645511011 is a deficient number, since it is larger than the sum of its proper divisors (236162733).

645511011 is a wasteful number, since it uses less digits than its factorization.

645511011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5248101.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 645511011 is about 25406.9087257777. The cubic root of 645511011 is about 864.2403751303.

Adding to 645511011 its reverse (110115546), we get a palindrome (755626557).

The spelling of 645511011 in words is "six hundred forty-five million, five hundred eleven thousand, eleven".