1655445561 has 64 divisors (see below), whose sum is σ = 2848075776. Its totient is φ = 830361600.

The previous prime is 1655445557. The next prime is 1655445607.

1655445561 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1655445561 - 2² = 1655445557 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1655445061) 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 63 ways as a sum of consecutive naturals, for example, 974665 + ... + 976361.

It is an arithmetic number, because the mean of its divisors is an integer number (44501184).

Almost surely, 2^1655445561 is an apocalyptic number.

1655445561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1655445561 is a deficient number, since it is larger than the sum of its proper divisors (1192630215).

1655445561 is a wasteful number, since it uses less digits than its factorization.

1655445561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1862.

The product of its digits is 360000, while the sum is 42.

The square root of 1655445561 is about 40687.1670308956. The cubic root of 1655445561 is about 1182.9642892213.

The spelling of 1655445561 in words is "one billion, six hundred fifty-five million, four hundred forty-five thousand, five hundred sixty-one".