1665155610 has 128 divisors (see below), whose sum is σ = 4906344960. Its totient is φ = 399725568.

The previous prime is 1665155599. The next prime is 1665155617. The reversal of 1665155610 is 165515661.

It is not an unprimeable number, because it can be changed into a prime (1665155617) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 97684 + ... + 113456.

It is an arithmetic number, because the mean of its divisors is an integer number (38330820).

Almost surely, 2^1665155610 is an apocalyptic number.

1665155610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665155610, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2453172480).

1665155610 is an abundant number, since it is smaller than the sum of its proper divisors (3241189350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1665155610 is a wasteful number, since it uses less digits than its factorization.

1665155610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15829 (or 15823 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 1665155610 is about 40806.3182607792. The cubic root of 1665155610 is about 1185.2726820004.

The spelling of 1665155610 in words is "one billion, six hundred sixty-five million, one hundred fifty-five thousand, six hundred ten".