66752865 has 12 divisors (see below), whose sum is σ = 115705044. Its totient is φ = 35601504.

The previous prime is 66752843. The next prime is 66752887. The reversal of 66752865 is 56825766.

66752865 is a `hidden beast` number, since 6 + 67 + 528 + 65 = 666.

It is an interprime number because it is at equal distance from previous prime (66752843) and next prime (66752887).

It can be written as a sum of positive squares in 2 ways, for example, as 42928704 + 23824161 = 6552^2 + 4881^2 .

It is not a de Polignac number, because 66752865 - 2¹³ = 66744673 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1483397 = 66752865 / (6 + 6 + 7 + 5 + 2 + 8 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 66752865.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 741654 + ... + 741743.

It is an arithmetic number, because the mean of its divisors is an integer number (9642087).

Almost surely, 2^66752865 is an apocalyptic number.

It is an amenable number.

66752865 is a deficient number, since it is larger than the sum of its proper divisors (48952179).

66752865 is a wasteful number, since it uses less digits than its factorization.

66752865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483408 (or 1483405 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 66752865 is about 8170.2426524553. The cubic root of 66752865 is about 405.6548163311.

The spelling of 66752865 in words is "sixty-six million, seven hundred fifty-two thousand, eight hundred sixty-five".