6656646413400 has 96 divisors (see below), whose sum is σ = 20636768366160. Its totient is φ = 1775005539840.

The previous prime is 6656646413393. The next prime is 6656646413401. The reversal of 6656646413400 is 43146466566.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656646413401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10647894 + ... + 11255706.

Almost surely, 2^{6656646413400} is an apocalyptic number.

6656646413400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6656646413400 is an abundant number, since it is smaller than the sum of its proper divisors (13980121952760).

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

6656646413400 is a wasteful number, since it uses less digits than its factorization.

6656646413400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626085 (or 626076 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 51.

The spelling of 6656646413400 in words is "six trillion, six hundred fifty-six billion, six hundred forty-six million, four hundred thirteen thousand, four hundred".