641361420521 has 8 divisors (see below), whose sum is σ = 647215480800. Its totient is φ = 635525074080.

The previous prime is 641361420517. The next prime is 641361420523. The reversal of 641361420521 is 125024163146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641361420521 - 2² = 641361420517 is a prime.

It is a super-2 number, since 2×641361420521² (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 (641361420523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4355711 + ... + 4500548.

It is an arithmetic number, because the mean of its divisors is an integer number (80901935100).

Almost surely, 2^641361420521 is an apocalyptic number.

It is an amenable number.

641361420521 is a deficient number, since it is larger than the sum of its proper divisors (5854060279).

641361420521 is a wasteful number, since it uses less digits than its factorization.

641361420521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8856919.

The product of its (nonzero) digits is 34560, while the sum is 35.

Adding to 641361420521 its reverse (125024163146), we get a palindrome (766385583667).

The spelling of 641361420521 in words is "six hundred forty-one billion, three hundred sixty-one million, four hundred twenty thousand, five hundred twenty-one".