6601556250 has 72 divisors (see below), whose sum is σ = 17878222908. Its totient is φ = 1760400000.

The previous prime is 6601556249. The next prime is 6601556261. The reversal of 6601556250 is 526551066.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1171487529 + 5430068721 = 34227^2 + 73689^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2431 + ... + 114930.

Almost surely, 2^6601556250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6601556250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8939111454).

6601556250 is an abundant number, since it is smaller than the sum of its proper divisors (11276666658).

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

6601556250 is a wasteful number, since it uses less digits than its factorization.

6601556250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117394 (or 117371 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 6601556250 is about 81249.9615384524. The cubic root of 6601556250 is about 1875.9248770463.

It can be divided in two parts, 66015 and 56250, that added together give a triangular number (122265 = T₄₉₄).

The spelling of 6601556250 in words is "six billion, six hundred one million, five hundred fifty-six thousand, two hundred fifty".