65515530 has 32 divisors (see below), whose sum is σ = 161489664. Its totient is φ = 16998336.

The previous prime is 65515487. The next prime is 65515537. The reversal of 65515530 is 3551556.

65515530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (65515537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28402 + ... + 30621.

It is an arithmetic number, because the mean of its divisors is an integer number (5046552).

Almost surely, 2^65515530 is an apocalyptic number.

65515530 is an abundant number, since it is smaller than the sum of its proper divisors (95974134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65515530 is a wasteful number, since it uses less digits than its factorization.

65515530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59070.

The product of its (nonzero) digits is 11250, while the sum is 30.

The square root of 65515530 is about 8094.1664178592. The cubic root of 65515530 is about 403.1327547333.

It can be divided in two parts, 6 and 5515530, that multiplied together give a triangular number (33093180 = T₈₁₃₅).

The spelling of 65515530 in words is "sixty-five million, five hundred fifteen thousand, five hundred thirty".