1355640065 has 8 divisors (see below), whose sum is σ = 1751904168. Its totient is φ = 1001088000.

The previous prime is 1355640049. The next prime is 1355640131. The reversal of 1355640065 is 5600465531.

It can be written as a sum of positive squares in 4 ways, for example, as 241615936 + 1114024129 = 15544^2 + 33377^2 .

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

It is not a de Polignac number, because 1355640065 - 2⁴ = 1355640049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10427936 + ... + 10428065.

It is an arithmetic number, because the mean of its divisors is an integer number (218988021).

Almost surely, 2^1355640065 is an apocalyptic number.

It is an amenable number.

1355640065 is a deficient number, since it is larger than the sum of its proper divisors (396264103).

1355640065 is a wasteful number, since it uses less digits than its factorization.

1355640065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20856019.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 1355640065 is about 36819.0177082442. The cubic root of 1355640065 is about 1106.7464353861.

The spelling of 1355640065 in words is "one billion, three hundred fifty-five million, six hundred forty thousand, sixty-five".