1655485709 has 4 divisors (see below), whose sum is σ = 1700228604. Its totient is φ = 1610742816.

The previous prime is 1655485693. The next prime is 1655485717. The reversal of 1655485709 is 9075845561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9075845561 = 57559 ⋅157679.

It can be written as a sum of positive squares in 2 ways, for example, as 674856484 + 980629225 = 25978^2 + 31315^2 .

It is a cyclic number.

It is not a de Polignac number, because 1655485709 - 2⁴ = 1655485693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1655482709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22371392 + ... + 22371465.

It is an arithmetic number, because the mean of its divisors is an integer number (425057151).

Almost surely, 2^1655485709 is an apocalyptic number.

It is an amenable number.

1655485709 is a deficient number, since it is larger than the sum of its proper divisors (44742895).

1655485709 is an equidigital number, since it uses as much as digits as its factorization.

1655485709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44742894.

The product of its (nonzero) digits is 1512000, while the sum is 50.

The square root of 1655485709 is about 40687.6604021416. The cubic root of 1655485709 is about 1182.9738522593.

The spelling of 1655485709 in words is "one billion, six hundred fifty-five million, four hundred eighty-five thousand, seven hundred nine".