641643586 has 4 divisors (see below), whose sum is σ = 962465382. Its totient is φ = 320821792.

The previous prime is 641643571. The next prime is 641643601. The reversal of 641643586 is 685346146.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (641643571) and next prime (641643601).

It can be written as a sum of positive squares in only one way, i.e., 608362225 + 33281361 = 24665^2 + 5769^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160410895 + ... + 160410898.

Almost surely, 2^641643586 is an apocalyptic number.

641643586 is a deficient number, since it is larger than the sum of its proper divisors (320821796).

641643586 is a wasteful number, since it uses less digits than its factorization.

641643586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320821795.

The product of its digits is 414720, while the sum is 43.

The square root of 641643586 is about 25330.6846729416. The cubic root of 641643586 is about 862.5109534701.

The spelling of 641643586 in words is "six hundred forty-one million, six hundred forty-three thousand, five hundred eighty-six".