66177381 has 8 divisors (see below), whose sum is σ = 88274304. Its totient is φ = 44099360.

The previous prime is 66177317. The next prime is 66177451. The reversal of 66177381 is 18377166.

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 66177381 - 2⁶ = 66177317 is a prime.

It is a super-2 number, since 2×66177381² = 8758891512038322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66173381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10036 + ... + 15266.

It is an arithmetic number, because the mean of its divisors is an integer number (11034288).

Almost surely, 2^66177381 is an apocalyptic number.

It is an amenable number.

66177381 is a deficient number, since it is larger than the sum of its proper divisors (22096923).

66177381 is a wasteful number, since it uses less digits than its factorization.

66177381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9451.

The product of its digits is 42336, while the sum is 39.

The square root of 66177381 is about 8134.9481252187. The cubic root of 66177381 is about 404.4857182052.

The spelling of 66177381 in words is "sixty-six million, one hundred seventy-seven thousand, three hundred eighty-one".