1655450820 has 144 divisors (see below), whose sum is σ = 5351149440. Its totient is φ = 412812288.

The previous prime is 1655450789. The next prime is 1655450827. The reversal of 1655450820 is 280545561.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1655450827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 497121 + ... + 500439.

It is an arithmetic number, because the mean of its divisors is an integer number (37160760).

Almost surely, 2^1655450820 is an apocalyptic number.

1655450820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1655450820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2675574720).

1655450820 is an abundant number, since it is smaller than the sum of its proper divisors (3695698620).

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

1655450820 is a wasteful number, since it uses less digits than its factorization.

1655450820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3514 (or 3509 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The square root of 1655450820 is about 40687.2316581013. The cubic root of 1655450820 is about 1182.9655418957.

The spelling of 1655450820 in words is "one billion, six hundred fifty-five million, four hundred fifty thousand, eight hundred twenty".