1355640165 has 64 divisors (see below), whose sum is σ = 2654945280. Its totient is φ = 650825280.

The previous prime is 1355640161. The next prime is 1355640179. The reversal of 1355640165 is 5610465531.

1355640165 is a `hidden beast` number, since 1 + 3 + 5 + 5 + 640 + 1 + 6 + 5 = 666.

It is not a de Polignac number, because 1355640165 - 2² = 1355640161 is a prime.

It is a super-2 number, since 2×1355640165² = 3675520513922454450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355640161) 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, 148524 + ... + 157386.

It is an arithmetic number, because the mean of its divisors is an integer number (41483520).

Almost surely, 2^1355640165 is an apocalyptic number.

1355640165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1355640165 is a deficient number, since it is larger than the sum of its proper divisors (1299305115).

1355640165 is a wasteful number, since it uses less digits than its factorization.

1355640165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8991 (or 8985 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 1355640165 is about 36819.0190662380. The cubic root of 1355640165 is about 1106.7464625995.

The spelling of 1355640165 in words is "one billion, three hundred fifty-five million, six hundred forty thousand, one hundred sixty-five".