66967865 has 8 divisors (see below), whose sum is σ = 80593800. Its totient is φ = 53419392.

The previous prime is 66967829. The next prime is 66967871. The reversal of 66967865 is 56876966.

It can be written as a sum of positive squares in 4 ways, for example, as 316969 + 66650896 = 563^2 + 8164^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66967865 - 2¹⁰ = 66966841 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17444 + ... + 20933.

It is an arithmetic number, because the mean of its divisors is an integer number (10074225).

Almost surely, 2^66967865 is an apocalyptic number.

It is an amenable number.

66967865 is a deficient number, since it is larger than the sum of its proper divisors (13625935).

66967865 is a wasteful number, since it uses less digits than its factorization.

66967865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38731.

The product of its digits is 3265920, while the sum is 53.

The square root of 66967865 is about 8183.3895788970. The cubic root of 66967865 is about 406.0898654076.

It can be divided in two parts, 6 and 6967865, that added together give a cube (6967871 = 191³).

The spelling of 66967865 in words is "sixty-six million, nine hundred sixty-seven thousand, eight hundred sixty-five".