6436542641 has 8 divisors (see below), whose sum is σ = 6550121544. Its totient is φ = 6323650560.

The previous prime is 6436542611. The next prime is 6436542643. The reversal of 6436542641 is 1462456346.

It can be written as a sum of positive squares in 4 ways, for example, as 4967430400 + 1469112241 = 70480^2 + 38329^2 .

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 6436542641 - 2⁶ = 6436542577 is a prime.

It is a super-2 number, since 2×6436542641² = 82858162338822509762, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6436542643) 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, 152780 + ... + 190301.

It is an arithmetic number, because the mean of its divisors is an integer number (818765193).

Almost surely, 2^6436542641 is an apocalyptic number.

It is an amenable number.

6436542641 is a deficient number, since it is larger than the sum of its proper divisors (113578903).

6436542641 is a wasteful number, since it uses less digits than its factorization.

6436542641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343411.

The product of its digits is 414720, while the sum is 41.

The square root of 6436542641 is about 80228.0664169342. The cubic root of 6436542641 is about 1860.1624940898.

Adding to 6436542641 its reverse (1462456346), we get a palindrome (7898998987).

The spelling of 6436542641 in words is "six billion, four hundred thirty-six million, five hundred forty-two thousand, six hundred forty-one".