66763181 has 8 divisors (see below), whose sum is σ = 71913984. Its totient is φ = 61799760.

The previous prime is 66763163. The next prime is 66763231. The reversal of 66763181 is 18136766.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66763181 is a prime.

It is a super-2 number, since 2×66763181² = 8914644674477522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66763381) 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, 46106 + ... + 47531.

It is an arithmetic number, because the mean of its divisors is an integer number (8989248).

Almost surely, 2^66763181 is an apocalyptic number.

It is an amenable number.

66763181 is a deficient number, since it is larger than the sum of its proper divisors (5150803).

66763181 is a wasteful number, since it uses less digits than its factorization.

66763181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93691.

The product of its digits is 36288, while the sum is 38.

The square root of 66763181 is about 8170.8739434653. The cubic root of 66763181 is about 405.6757119113.

The spelling of 66763181 in words is "sixty-six million, seven hundred sixty-three thousand, one hundred eighty-one".