1603778465 has 4 divisors (see below), whose sum is σ = 1924534164. Its totient is φ = 1283022768.

The previous prime is 1603778461. The next prime is 1603778483. The reversal of 1603778465 is 5648773061.

1603778465 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5648773061 = 599 ⋅9430339.

It can be written as a sum of positive squares in 2 ways, for example, as 1027010209 + 576768256 = 32047^2 + 24016^2 .

It is a cyclic number.

It is not a de Polignac number, because 1603778465 - 2² = 1603778461 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1603778461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160377842 + ... + 160377851.

It is an arithmetic number, because the mean of its divisors is an integer number (481133541).

Almost surely, 2^1603778465 is an apocalyptic number.

It is an amenable number.

1603778465 is a deficient number, since it is larger than the sum of its proper divisors (320755699).

1603778465 is an equidigital number, since it uses as much as digits as its factorization.

1603778465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320755698.

The product of its (nonzero) digits is 846720, while the sum is 47.

The square root of 1603778465 is about 40047.2029610059. The cubic root of 1603778465 is about 1170.5270630413.

The spelling of 1603778465 in words is "one billion, six hundred three million, seven hundred seventy-eight thousand, four hundred sixty-five".