1645465065 has 16 divisors (see below), whose sum is σ = 2688761088. Its totient is φ = 858909056.

The previous prime is 1645465043. The next prime is 1645465069. The reversal of 1645465065 is 5605645461.

1645465065 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1645465065 - 2⁶ = 1645465001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645465069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1166292 + ... + 1167701.

It is an arithmetic number, because the mean of its divisors is an integer number (168047568).

Almost surely, 2^1645465065 is an apocalyptic number.

1645465065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1645465065 is a deficient number, since it is larger than the sum of its proper divisors (1043296023).

1645465065 is a wasteful number, since it uses less digits than its factorization.

1645465065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334048.

The product of its (nonzero) digits is 432000, while the sum is 42.

The square root of 1645465065 is about 40564.3324239411. The cubic root of 1645465065 is about 1180.5821758582.

The spelling of 1645465065 in words is "one billion, six hundred forty-five million, four hundred sixty-five thousand, sixty-five".