6640411634 has 4 divisors (see below), whose sum is σ = 9960617454. Its totient is φ = 3320205816.

The previous prime is 6640411601. The next prime is 6640411681. The reversal of 6640411634 is 4361140466.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 5252625625 + 1387786009 = 72475^2 + 37253^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6640411594 and 6640411603.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1660102907 + ... + 1660102910.

Almost surely, 2^6640411634 is an apocalyptic number.

6640411634 is a deficient number, since it is larger than the sum of its proper divisors (3320205820).

6640411634 is a wasteful number, since it uses less digits than its factorization.

6640411634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320205819.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 6640411634 is about 81488.7209005025. The cubic root of 6640411634 is about 1879.5981140727.

The spelling of 6640411634 in words is "six billion, six hundred forty million, four hundred eleven thousand, six hundred thirty-four".