65156065 has 16 divisors (see below), whose sum is σ = 84437136. Its totient is φ = 47980800.

The previous prime is 65156057. The next prime is 65156071. The reversal of 65156065 is 56065156.

It can be written as a sum of positive squares in 8 ways, for example, as 46294416 + 18861649 = 6804^2 + 4343^2 .

It is not a de Polignac number, because 65156065 - 2³ = 65156057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65156065.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26175 + ... + 28555.

It is an arithmetic number, because the mean of its divisors is an integer number (5277321).

Almost surely, 2^65156065 is an apocalyptic number.

65156065 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

65156065 is a deficient number, since it is larger than the sum of its proper divisors (19281071).

65156065 is a wasteful number, since it uses less digits than its factorization.

65156065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 65156065 is about 8071.9306860255. The cubic root of 65156065 is about 402.3941107458.

Subtracting from 65156065 its reverse (56065156), we obtain a palindrome (9090909).

It can be divided in two parts, 65 and 156065, that multiplied together give a square (10144225 = 3185²).

The spelling of 65156065 in words is "sixty-five million, one hundred fifty-six thousand, sixty-five".