1655090820 has 60 divisors (see below), whose sum is σ = 5192086284. Its totient is φ = 441357120.

The previous prime is 1655090819. The next prime is 1655090831. The reversal of 1655090820 is 280905561.

It is a happy number.

1655090820 is a `hidden beast` number, since 16 + 550 + 90 + 8 + 2 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 501401664 + 1153689156 = 22392^2 + 33966^2 .

It is a tau number, because it is divible by the number of its divisors (60).

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 509211 + ... + 512450.

Almost surely, 2^1655090820 is an apocalyptic number.

1655090820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1655090820 is an abundant number, since it is smaller than the sum of its proper divisors (3536995464).

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

1655090820 is a wasteful number, since it uses less digits than its factorization.

1655090820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021682 (or 1021671 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 1655090820 is about 40682.8074252503. The cubic root of 1655090820 is about 1182.8797851008.

The spelling of 1655090820 in words is "one billion, six hundred fifty-five million, ninety thousand, eight hundred twenty".