645261606411 has 16 divisors (see below), whose sum is σ = 911315124000. Its totient is φ = 404711111168.

The previous prime is 645261606397. The next prime is 645261606427. The reversal of 645261606411 is 114606162546.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 645261606411 - 2⁶ = 645261606347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645261606491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2351796 + ... + 2611793.

It is an arithmetic number, because the mean of its divisors is an integer number (56957195250).

Almost surely, 2^645261606411 is an apocalyptic number.

645261606411 is a deficient number, since it is larger than the sum of its proper divisors (266053517589).

645261606411 is a wasteful number, since it uses less digits than its factorization.

645261606411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4966158.

The product of its (nonzero) digits is 207360, while the sum is 42.

Adding to 645261606411 its reverse (114606162546), we get a palindrome (759867768957).

The spelling of 645261606411 in words is "six hundred forty-five billion, two hundred sixty-one million, six hundred six thousand, four hundred eleven".