1665522647880 has 256 divisors, whose sum is σ = 6275126592000. Its totient is φ = 351406863360.

The previous prime is 1665522647869. The next prime is 1665522647881. The reversal of 1665522647880 is 887462255661.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (1665522647881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1021251 + ... + 2091410.

It is an arithmetic number, because the mean of its divisors is an integer number (24512213250).

Almost surely, 2^{1665522647880} is an apocalyptic number.

1665522647880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665522647880 is an abundant number, since it is smaller than the sum of its proper divisors (4609603944120).

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

1665522647880 is a wasteful number, since it uses less digits than its factorization.

1665522647880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3112709 (or 3112691 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 60.

The spelling of 1665522647880 in words is "one trillion, six hundred sixty-five billion, five hundred twenty-two million, six hundred forty-seven thousand, eight hundred eighty".