65525615 has 4 divisors (see below), whose sum is σ = 78630744. Its totient is φ = 52420488.

The previous prime is 65525609. The next prime is 65525639. The reversal of 65525615 is 51652556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65525615 - 2¹⁶ = 65460079 is a prime.

It is a super-2 number, since 2×65525615² = 8587212442256450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6552557 + ... + 6552566.

It is an arithmetic number, because the mean of its divisors is an integer number (19657686).

Almost surely, 2^65525615 is an apocalyptic number.

65525615 is a deficient number, since it is larger than the sum of its proper divisors (13105129).

65525615 is a wasteful number, since it uses less digits than its factorization.

65525615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13105128.

The product of its digits is 45000, while the sum is 35.

The square root of 65525615 is about 8094.7893734179. The cubic root of 65525615 is about 403.1534388126.

It can be divided in two parts, 6552 and 5615, that added together give a cube (12167 = 23³).

The spelling of 65525615 in words is "sixty-five million, five hundred twenty-five thousand, six hundred fifteen".