6662221646520 has 128 divisors (see below), whose sum is σ = 21834741127680. Its totient is φ = 1612779840000.

The previous prime is 6662221646519. The next prime is 6662221646527. The reversal of 6662221646520 is 256461222666.

It is a super-2 number, since 2×6662221646520² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6662221646520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6662221646527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2674636 + ... + 4525275.

It is an arithmetic number, because the mean of its divisors is an integer number (170583915060).

Almost surely, 2^{6662221646520} is an apocalyptic number.

6662221646520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6662221646520 is an abundant number, since it is smaller than the sum of its proper divisors (15172519481160).

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

6662221646520 is a wasteful number, since it uses less digits than its factorization.

6662221646520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7200637 (or 7200633 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 48.

The spelling of 6662221646520 in words is "six trillion, six hundred sixty-two billion, two hundred twenty-one million, six hundred forty-six thousand, five hundred twenty".