1665332655 has 32 divisors (see below), whose sum is σ = 3058521600. Its totient is φ = 757959552.

The previous prime is 1665332651. The next prime is 1665332659. The reversal of 1665332655 is 5562335661.

It is an interprime number because it is at equal distance from previous prime (1665332651) and next prime (1665332659).

It is not a de Polignac number, because 1665332655 - 2² = 1665332651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665332651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10585 + ... + 58674.

It is an arithmetic number, because the mean of its divisors is an integer number (95578800).

Almost surely, 2^1665332655 is an apocalyptic number.

1665332655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1665332655 is a deficient number, since it is larger than the sum of its proper divisors (1393188945).

1665332655 is a wasteful number, since it uses less digits than its factorization.

1665332655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69503.

The product of its digits is 486000, while the sum is 42.

The square root of 1665332655 is about 40808.4875362957. The cubic root of 1665332655 is about 1185.3146879174.

The spelling of 1665332655 in words is "one billion, six hundred sixty-five million, three hundred thirty-two thousand, six hundred fifty-five".