6661220756512 has 48 divisors (see below), whose sum is σ = 15065403518592. Its totient is φ = 2840017121280.

The previous prime is 6661220756459. The next prime is 6661220756569. The reversal of 6661220756512 is 2156570221666.

It is a super-2 number, since 2×6661220756512² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76997164 + ... + 77083627.

It is an arithmetic number, because the mean of its divisors is an integer number (313862573304).

Almost surely, 2^{6661220756512} is an apocalyptic number.

It is an amenable number.

6661220756512 is an abundant number, since it is smaller than the sum of its proper divisors (8404182762080).

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

6661220756512 is a wasteful number, since it uses less digits than its factorization.

6661220756512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154081001 (or 154080993 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 6661220756512 in words is "six trillion, six hundred sixty-one billion, two hundred twenty million, seven hundred fifty-six thousand, five hundred twelve".