6626606640 has 80 divisors (see below), whose sum is σ = 20589182208. Its totient is φ = 1763077888.

The previous prime is 6626606629. The next prime is 6626606641. The reversal of 6626606640 is 466066266.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×6626606640² = 87823831122584179200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6626606592 and 6626606601.

It is not an unprimeable number, because it can be changed into a prime (6626606641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75157 + ... + 137483.

Almost surely, 2^6626606640 is an apocalyptic number.

6626606640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6626606640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10294591104).

6626606640 is an abundant number, since it is smaller than the sum of its proper divisors (13962575568).

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

6626606640 is a wasteful number, since it uses less digits than its factorization.

6626606640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62786 (or 62780 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 42.

The square root of 6626606640 is about 81403.9718932682. The cubic root of 6626606640 is about 1878.2946887120.

The spelling of 6626606640 in words is "six billion, six hundred twenty-six million, six hundred six thousand, six hundred forty".