1655057665 has 8 divisors (see below), whose sum is σ = 1997043048. Its totient is φ = 1316730240.

The previous prime is 1655057629. The next prime is 1655057687. The reversal of 1655057665 is 5667505561.

It can be written as a sum of positive squares in 4 ways, for example, as 166332609 + 1488725056 = 12897^2 + 38584^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1655057665 - 2⁹ = 1655057153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 913492 + ... + 915301.

It is an arithmetic number, because the mean of its divisors is an integer number (249630381).

Almost surely, 2^1655057665 is an apocalyptic number.

It is an amenable number.

1655057665 is a deficient number, since it is larger than the sum of its proper divisors (341985383).

1655057665 is a wasteful number, since it uses less digits than its factorization.

1655057665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828979.

The product of its (nonzero) digits is 945000, while the sum is 46.

The square root of 1655057665 is about 40682.3999414980. The cubic root of 1655057665 is about 1182.8718865129.

The spelling of 1655057665 in words is "one billion, six hundred fifty-five million, fifty-seven thousand, six hundred sixty-five".