1605661650500 has 48 divisors (see below), whose sum is σ = 3525125280768. Its totient is φ = 638901980000.

The previous prime is 1605661650473. The next prime is 1605661650511. The reversal of 1605661650500 is 50561665061.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8311106 + ... + 8502105.

It is an arithmetic number, because the mean of its divisors is an integer number (73440110016).

Almost surely, 2^{1605661650500} is an apocalyptic number.

1605661650500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605661650500 is an abundant number, since it is smaller than the sum of its proper divisors (1919463630268).

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

1605661650500 is a wasteful number, since it uses less digits than its factorization.

1605661650500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16813421 (or 16813409 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 1605661650500 in words is "one trillion, six hundred five billion, six hundred sixty-one million, six hundred fifty thousand, five hundred".