1665526065 has 16 divisors (see below), whose sum is σ = 3045533568. Its totient is φ = 761383296.

The previous prime is 1665526063. The next prime is 1665526081. The reversal of 1665526065 is 5606255661.

It is not a de Polignac number, because 1665526065 - 2¹ = 1665526063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1665526063) 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, 7930972 + ... + 7931181.

It is an arithmetic number, because the mean of its divisors is an integer number (190345848).

Almost surely, 2^1665526065 is an apocalyptic number.

1665526065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1665526065 is a deficient number, since it is larger than the sum of its proper divisors (1380007503).

1665526065 is a wasteful number, since it uses less digits than its factorization.

1665526065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15862168.

The product of its (nonzero) digits is 324000, while the sum is 42.

The square root of 1665526065 is about 40810.8571951141. The cubic root of 1665526065 is about 1185.3605732122.

The spelling of 1665526065 in words is "one billion, six hundred sixty-five million, five hundred twenty-six thousand, sixty-five".