1665147721960 has 64 divisors (see below), whose sum is σ = 3768023318400. Its totient is φ = 662248379136.

The previous prime is 1665147721883. The next prime is 1665147721967. The reversal of 1665147721960 is 691277415661.

It is not an unprimeable number, because it can be changed into a prime (1665147721967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84571237 + ... + 84590923.

It is an arithmetic number, because the mean of its divisors is an integer number (58875364350).

Almost surely, 2^{1665147721960} is an apocalyptic number.

1665147721960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665147721960 is an abundant number, since it is smaller than the sum of its proper divisors (2102875596440).

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

1665147721960 is a wasteful number, since it uses less digits than its factorization.

1665147721960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31690 (or 31686 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 1665147721960 in words is "one trillion, six hundred sixty-five billion, one hundred forty-seven million, seven hundred twenty-one thousand, nine hundred sixty".