641437065 has 24 divisors (see below), whose sum is σ = 1115641800. Its totient is φ = 340925184.

The previous prime is 641437061. The next prime is 641437067. The reversal of 641437065 is 560734146.

It is a happy number.

641437065 is a `hidden beast` number, since 641 + 4 + 3 + 7 + 0 + 6 + 5 = 666.

641437065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 177982281 + 463454784 = 13341^2 + 21528^2 .

It is not a de Polignac number, because 641437065 - 2² = 641437061 is a prime.

It is a super-2 number, since 2×641437065² = 822883016711628450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641437061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11140 + ... + 37509.

It is an arithmetic number, because the mean of its divisors is an integer number (46485075).

Almost surely, 2^641437065 is an apocalyptic number.

It is an amenable number.

641437065 is a deficient number, since it is larger than the sum of its proper divisors (474204735).

641437065 is a wasteful number, since it uses less digits than its factorization.

641437065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48953 (or 48950 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 641437065 is about 25326.6078462948. The cubic root of 641437065 is about 862.4184069003.

The spelling of 641437065 in words is "six hundred forty-one million, four hundred thirty-seven thousand, sixty-five".