641365101523 has 4 divisors (see below), whose sum is σ = 641375200408. Its totient is φ = 641355002640.

The previous prime is 641365101497. The next prime is 641365101539. The reversal of 641365101523 is 325101563146.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641365101523 is a prime.

It is a super-2 number, since 2×641365101523² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641365101583) 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, 4953573 + ... + 5081398.

It is an arithmetic number, because the mean of its divisors is an integer number (160343800102).

Almost surely, 2^641365101523 is an apocalyptic number.

641365101523 is a deficient number, since it is larger than the sum of its proper divisors (10098885).

641365101523 is a wasteful number, since it uses less digits than its factorization.

641365101523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10098884.

The product of its (nonzero) digits is 64800, while the sum is 37.

Adding to 641365101523 its reverse (325101563146), we get a palindrome (966466664669).

The spelling of 641365101523 in words is "six hundred forty-one billion, three hundred sixty-five million, one hundred one thousand, five hundred twenty-three".