1605537040220 has 24 divisors (see below), whose sum is σ = 3385617951408. Its totient is φ = 639550022400.

The previous prime is 1605537040207. The next prime is 1605537040241. The reversal of 1605537040220 is 220407355061.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166544666 + ... + 166554305.

It is an arithmetic number, because the mean of its divisors is an integer number (141067414642).

Almost surely, 2^{1605537040220} is an apocalyptic number.

1605537040220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605537040220 is an abundant number, since it is smaller than the sum of its proper divisors (1780080911188).

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

1605537040220 is a wasteful number, since it uses less digits than its factorization.

1605537040220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333099221 (or 333099219 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 35.

The spelling of 1605537040220 in words is "one trillion, six hundred five billion, five hundred thirty-seven million, forty thousand, two hundred twenty".