1665430352020 has 12 divisors (see below), whose sum is σ = 3497403739284. Its totient is φ = 666172140800.

The previous prime is 1665430351997. The next prime is 1665430352023. The reversal of 1665430352020 is 202530345661.

It can be written as a sum of positive squares in 2 ways, for example, as 758216011536 + 907214340484 = 870756^2 + 952478^2 .

It is a super-2 number, since 2×1665430352020² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665430352023) 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 3 ways as a sum of consecutive naturals, for example, 41635758781 + ... + 41635758820.

It is an arithmetic number, because the mean of its divisors is an integer number (291450311607).

Almost surely, 2^{1665430352020} is an apocalyptic number.

1665430352020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665430352020 is an abundant number, since it is smaller than the sum of its proper divisors (1831973387264).

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

1665430352020 is a wasteful number, since it uses less digits than its factorization.

1665430352020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83271517610 (or 83271517608 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 37.

Adding to 1665430352020 its reverse (202530345661), we get a palindrome (1867960697681).

The spelling of 1665430352020 in words is "one trillion, six hundred sixty-five billion, four hundred thirty million, three hundred fifty-two thousand, twenty".