66285775601378 has 4 divisors (see below), whose sum is σ = 99428663402070. Its totient is φ = 33142887800688.

The previous prime is 66285775601359. The next prime is 66285775601401. The reversal of 66285775601378 is 87310657758266.

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

It can be written as a sum of positive squares in only one way, i.e., 37407694489489 + 28878081111889 = 6116183^2 + 5373833^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16571443900343 + ... + 16571443900346.

Almost surely, 2^{66285775601378} is an apocalyptic number.

66285775601378 is a deficient number, since it is larger than the sum of its proper divisors (33142887800692).

66285775601378 is a wasteful number, since it uses less digits than its factorization.

66285775601378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33142887800691.

The product of its (nonzero) digits is 711244800, while the sum is 71.

The spelling of 66285775601378 in words is "sixty-six trillion, two hundred eighty-five billion, seven hundred seventy-five million, six hundred one thousand, three hundred seventy-eight".