6655440780 has 72 divisors (see below), whose sum is σ = 20196540000. Its totient is φ = 1774048512.

The previous prime is 6655440763. The next prime is 6655440863. The reversal of 6655440780 is 870445566.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 533656 + ... + 545984.

It is an arithmetic number, because the mean of its divisors is an integer number (280507500).

Almost surely, 2^6655440780 is an apocalyptic number.

6655440780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6655440780 is an abundant number, since it is smaller than the sum of its proper divisors (13541099220).

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

6655440780 is a wasteful number, since it uses less digits than its factorization.

6655440780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15343 (or 15338 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The square root of 6655440780 is about 81580.8848934602. The cubic root of 6655440780 is about 1881.0150678765.

It can be divided in two parts, 665 and 5440780, that added together give a palindrome (5441445).

The spelling of 6655440780 in words is "six billion, six hundred fifty-five million, four hundred forty thousand, seven hundred eighty".