1655005665 has 8 divisors (see below), whose sum is σ = 2648009088. Its totient is φ = 882669680.

The previous prime is 1655005663. The next prime is 1655005673. The reversal of 1655005665 is 5665005561.

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

It is not a de Polignac number, because 1655005665 - 2¹ = 1655005663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1655005663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55166841 + ... + 55166870.

It is an arithmetic number, because the mean of its divisors is an integer number (331001136).

Almost surely, 2^1655005665 is an apocalyptic number.

1655005665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1655005665 is a deficient number, since it is larger than the sum of its proper divisors (993003423).

1655005665 is a wasteful number, since it uses less digits than its factorization.

1655005665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110333719.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 1655005665 is about 40681.7608394720. The cubic root of 1655005665 is about 1182.8594982271.

The spelling of 1655005665 in words is "one billion, six hundred fifty-five million, five thousand, six hundred sixty-five".