6356661640 has 128 divisors (see below), whose sum is σ = 16748467200. Its totient is φ = 2126039040.

The previous prime is 6356661637. The next prime is 6356661667. The reversal of 6356661640 is 461666536.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5381850 + ... + 5383030.

It is an arithmetic number, because the mean of its divisors is an integer number (130847400).

Almost surely, 2^6356661640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6356661640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8374233600).

6356661640 is an abundant number, since it is smaller than the sum of its proper divisors (10391805560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6356661640 is a wasteful number, since it uses less digits than its factorization.

6356661640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655 (or 1651 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 43.

The square root of 6356661640 is about 79728.6751426361. The cubic root of 6356661640 is about 1852.4352288458.

The spelling of 6356661640 in words is "six billion, three hundred fifty-six million, six hundred sixty-one thousand, six hundred forty".