6646261880 has 16 divisors (see below), whose sum is σ = 14954089320. Its totient is φ = 2658504736.

The previous prime is 6646261849. The next prime is 6646261891. The reversal of 6646261880 is 881626466.

It is a happy number.

It is a super-2 number, since 2×6646261880² = 88345593955082268800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83078234 + ... + 83078313.

Almost surely, 2^6646261880 is an apocalyptic number.

It is an amenable number.

6646261880 is an abundant number, since it is smaller than the sum of its proper divisors (8307827440).

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

6646261880 is a wasteful number, since it uses less digits than its factorization.

6646261880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166156558 (or 166156554 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 47.

The square root of 6646261880 is about 81524.6090453674. The cubic root of 6646261880 is about 1880.1499314558.

The spelling of 6646261880 in words is "six billion, six hundred forty-six million, two hundred sixty-one thousand, eight hundred eighty".