6654877866 has 120 divisors (see below), whose sum is σ = 18681076260. Its totient is φ = 1755105408.

The previous prime is 6654877837. The next prime is 6654877877. The reversal of 6654877866 is 6687784566.

6654877866 is a `hidden beast` number, since 6 + 6 + 548 + 7 + 7 + 86 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6533327241 + 121550625 = 80829^2 + 11025^2 .

It is a super-2 number, since 2×6654877866² = 88574798822753427912, which contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

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

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 70950 + ... + 135438.

Almost surely, 2^6654877866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6654877866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9340538130).

6654877866 is an abundant number, since it is smaller than the sum of its proper divisors (12026198394).

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

6654877866 is a wasteful number, since it uses less digits than its factorization.

6654877866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64530 (or 64514 counting only the distinct ones).

The product of its digits is 81285120, while the sum is 63.

The square root of 6654877866 is about 81577.4347843814. The cubic root of 6654877866 is about 1880.9620345962.

The spelling of 6654877866 in words is "six billion, six hundred fifty-four million, eight hundred seventy-seven thousand, eight hundred sixty-six".