1665315520 has 56 divisors (see below), whose sum is σ = 4326044688. Its totient is φ = 605568000.

The previous prime is 1665315511. The next prime is 1665315527. The reversal of 1665315520 is 255135661.

It is not an unprimeable number, because it can be changed into a prime (1665315527) 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, 233031 + ... + 240070.

It is an arithmetic number, because the mean of its divisors is an integer number (77250798).

Almost surely, 2^1665315520 is an apocalyptic number.

1665315520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665315520 is an abundant number, since it is smaller than the sum of its proper divisors (2660729168).

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

1665315520 is a wasteful number, since it uses less digits than its factorization.

1665315520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473129 (or 473119 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 1665315520 is about 40808.2775916848. The cubic root of 1665315520 is about 1185.3106225761.

The spelling of 1665315520 in words is "one billion, six hundred sixty-five million, three hundred fifteen thousand, five hundred twenty".