645150242011 has 4 divisors (see below), whose sum is σ = 703800264024. Its totient is φ = 586500220000.

The previous prime is 645150241979. The next prime is 645150242057. The reversal of 645150242011 is 110242051546.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645150242011 - 2⁵ = 645150241979 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (645150242071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29325010990 + ... + 29325011011.

It is an arithmetic number, because the mean of its divisors is an integer number (175950066006).

Almost surely, 2^645150242011 is an apocalyptic number.

645150242011 is a deficient number, since it is larger than the sum of its proper divisors (58650022013).

645150242011 is a wasteful number, since it uses less digits than its factorization.

645150242011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58650022012.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 645150242011 its reverse (110242051546), we get a palindrome (755392293557).

The spelling of 645150242011 in words is "six hundred forty-five billion, one hundred fifty million, two hundred forty-two thousand, eleven".