66261355 has 8 divisors (see below), whose sum is σ = 80257392. Its totient is φ = 52513248.

The previous prime is 66261347. The next prime is 66261401. The reversal of 66261355 is 55316266.

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 66261355 - 2³ = 66261347 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 66261355.

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, 61392 + ... + 62461.

It is an arithmetic number, because the mean of its divisors is an integer number (10032174).

Almost surely, 2^66261355 is an apocalyptic number.

66261355 is a deficient number, since it is larger than the sum of its proper divisors (13996037).

66261355 is a wasteful number, since it uses less digits than its factorization.

66261355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123965.

The product of its digits is 32400, while the sum is 34.

The square root of 66261355 is about 8140.1078002690. The cubic root of 66261355 is about 404.6567329660.

The spelling of 66261355 in words is "sixty-six million, two hundred sixty-one thousand, three hundred fifty-five".