1655620161 has 24 divisors (see below), whose sum is σ = 2393025120. Its totient is φ = 1017709056.

The previous prime is 1655620147. The next prime is 1655620171. The reversal of 1655620161 is 1610265561.

It is not a de Polignac number, because 1655620161 - 2⁵ = 1655620129 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1655620171) 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 23 ways as a sum of consecutive naturals, for example, 819825 + ... + 821841.

It is an arithmetic number, because the mean of its divisors is an integer number (99709380).

Almost surely, 2^1655620161 is an apocalyptic number.

It is an amenable number.

1655620161 is a deficient number, since it is larger than the sum of its proper divisors (737404959).

1655620161 is a wasteful number, since it uses less digits than its factorization.

1655620161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3665 (or 3652 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 1655620161 is about 40689.3126140022. The cubic root of 1655620161 is about 1183.0058768778.

The spelling of 1655620161 in words is "one billion, six hundred fifty-five million, six hundred twenty thousand, one hundred sixty-one".