6644157477048 has 576 divisors, whose sum is σ = 24370580052000. Its totient is φ = 1615203846144.

The previous prime is 6644157477017. The next prime is 6644157477059. The reversal of 6644157477048 is 8407747514466.

6644157477048 is a `hidden beast` number, since 6 + 6 + 4 + 4 + 157 + 477 + 0 + 4 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 32139358 + ... + 32345426.

Almost surely, 2^{6644157477048} 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 6644157477048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12185290026000).

6644157477048 is an abundant number, since it is smaller than the sum of its proper divisors (17726422574952).

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

6644157477048 is a wasteful number, since it uses less digits than its factorization.

6644157477048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206164 (or 206150 counting only the distinct ones).

The product of its (nonzero) digits is 126443520, while the sum is 63.

The spelling of 6644157477048 in words is "six trillion, six hundred forty-four billion, one hundred fifty-seven million, four hundred seventy-seven thousand, forty-eight".