1605166555660 has 24 divisors (see below), whose sum is σ = 3371190638256. Its totient is φ = 642001694400.

The previous prime is 1605166555639. The next prime is 1605166555661. The reversal of 1605166555660 is 665556615061.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1605166555598 and 1605166555607.

It is not an unprimeable number, because it can be changed into a prime (1605166555661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3855022 + ... + 4251061.

It is an arithmetic number, because the mean of its divisors is an integer number (140466276594).

Almost surely, 2^{1605166555660} is an apocalyptic number.

1605166555660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605166555660 is an abundant number, since it is smaller than the sum of its proper divisors (1766024082596).

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

1605166555660 is a wasteful number, since it uses less digits than its factorization.

1605166555660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8115993 (or 8115991 counting only the distinct ones).

The product of its (nonzero) digits is 4860000, while the sum is 52.

It can be divided in two parts, 160516 and 6555660, that added together give a palindrome (6716176).

The spelling of 1605166555660 in words is "one trillion, six hundred five billion, one hundred sixty-six million, five hundred fifty-five thousand, six hundred sixty".