1320918165 has 64 divisors (see below), whose sum is σ = 2690457600. Its totient is φ = 602344512.

The previous prime is 1320918163. The next prime is 1320918229. The reversal of 1320918165 is 5618190231.

It is not a de Polignac number, because 1320918165 - 2¹ = 1320918163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320918163) 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, 436026 + ... + 439044.

It is an arithmetic number, because the mean of its divisors is an integer number (42038400).

Almost surely, 2^1320918165 is an apocalyptic number.

1320918165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1320918165 is an abundant number, since it is smaller than the sum of its proper divisors (1369539435).

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

1320918165 is a wasteful number, since it uses less digits than its factorization.

1320918165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3503 (or 3497 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1320918165 is about 36344.4378825701. The cubic root of 1320918165 is about 1097.2155928210.

The spelling of 1320918165 in words is "one billion, three hundred twenty million, nine hundred eighteen thousand, one hundred sixty-five".