1665051655 has 8 divisors (see below), whose sum is σ = 2115595152. Its totient is φ = 1253685888.

The previous prime is 1665051611. The next prime is 1665051659. The reversal of 1665051655 is 5561505661.

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

It is a cyclic number.

It is not a de Polignac number, because 1665051655 - 2¹⁷ = 1664920583 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 (1665051659) 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, 9794337 + ... + 9794506.

It is an arithmetic number, because the mean of its divisors is an integer number (264449394).

Almost surely, 2^1665051655 is an apocalyptic number.

1665051655 is a deficient number, since it is larger than the sum of its proper divisors (450543497).

1665051655 is a wasteful number, since it uses less digits than its factorization.

1665051655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19588865.

The product of its (nonzero) digits is 135000, while the sum is 40.

The square root of 1665051655 is about 40805.0444798189. The cubic root of 1665051655 is about 1185.2480161203.

The spelling of 1665051655 in words is "one billion, six hundred sixty-five million, fifty-one thousand, six hundred fifty-five".