66880355 has 4 divisors (see below), whose sum is σ = 80256432. Its totient is φ = 53504280.

The previous prime is 66880313. The next prime is 66880357. The reversal of 66880355 is 55308866.

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

It is not a de Polignac number, because 66880355 - 2¹⁴ = 66863971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66880357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6688031 + ... + 6688040.

It is an arithmetic number, because the mean of its divisors is an integer number (20064108).

Almost surely, 2^66880355 is an apocalyptic number.

66880355 is a deficient number, since it is larger than the sum of its proper divisors (13376077).

66880355 is a wasteful number, since it uses less digits than its factorization.

66880355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13376076.

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 66880355 is about 8178.0410245975. The cubic root of 66880355 is about 405.9129028469.

The spelling of 66880355 in words is "sixty-six million, eight hundred eighty thousand, three hundred fifty-five".