641463303661 has 4 divisors (see below), whose sum is σ = 642099046300. Its totient is φ = 640827561024.

The previous prime is 641463303647. The next prime is 641463303667. The reversal of 641463303661 is 166303364146.

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

It can be written as a sum of positive squares in 2 ways, for example, as 187234482436 + 454228821225 = 432706^2 + 673965^2 .

It is a cyclic number.

It is not a de Polignac number, because 641463303661 - 2²³ = 641454915053 is a prime.

It is a super-2 number, since 2×641463303661² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641463303667) 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, 317869806 + ... + 317871823.

It is an arithmetic number, because the mean of its divisors is an integer number (160524761575).

Almost surely, 2^641463303661 is an apocalyptic number.

It is an amenable number.

641463303661 is a deficient number, since it is larger than the sum of its proper divisors (635742639).

641463303661 is a wasteful number, since it uses less digits than its factorization.

641463303661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635742638.

The product of its (nonzero) digits is 559872, while the sum is 43.

The spelling of 641463303661 in words is "six hundred forty-one billion, four hundred sixty-three million, three hundred three thousand, six hundred sixty-one".