6557697144 has 96 divisors (see below), whose sum is σ = 18438441840. Its totient is φ = 2183500800.

The previous prime is 6557697143. The next prime is 6557697217. The reversal of 6557697144 is 4417967556.

6557697144 is a `hidden beast` number, since 65 + 576 + 9 + 7 + 1 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6557697143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3150184 + ... + 3152264.

Almost surely, 2^6557697144 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 6557697144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9219220920).

6557697144 is an abundant number, since it is smaller than the sum of its proper divisors (11880744696).

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

6557697144 is a wasteful number, since it uses less digits than its factorization.

6557697144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3723 (or 3707 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 54.

The square root of 6557697144 is about 80979.6094334864. The cubic root of 6557697144 is about 1871.7612491373.

The spelling of 6557697144 in words is "six billion, five hundred fifty-seven million, six hundred ninety-seven thousand, one hundred forty-four".