641542245145 has 16 divisors (see below), whose sum is σ = 770564172240. Its totient is φ = 512758358784.

The previous prime is 641542245101. The next prime is 641542245151. The reversal of 641542245145 is 541542245146.

It can be written as a sum of positive squares in 8 ways, for example, as 7868931849 + 633673313296 = 88707^2 + 796036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641542245145 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29672359 + ... + 29693971.

It is an arithmetic number, because the mean of its divisors is an integer number (48160260765).

Almost surely, 2^641542245145 is an apocalyptic number.

It is an amenable number.

641542245145 is a deficient number, since it is larger than the sum of its proper divisors (129021927095).

641542245145 is a wasteful number, since it uses less digits than its factorization.

641542245145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26844.

The product of its digits is 768000, while the sum is 43.

Subtracting from 641542245145 its reverse (541542245146), we obtain a palindrome (99999999999).

The spelling of 641542245145 in words is "six hundred forty-one billion, five hundred forty-two million, two hundred forty-five thousand, one hundred forty-five".