66713381 has 8 divisors (see below), whose sum is σ = 76476864. Its totient is φ = 57008160.

The previous prime is 66713371. The next prime is 66713401. The reversal of 66713381 is 18331766.

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 66713381 - 2¹⁰ = 66712357 is a prime.

It is a super-2 number, since 2×66713381² = 8901350408902322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66713371) 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, 12080 + ... + 16713.

It is an arithmetic number, because the mean of its divisors is an integer number (9559608).

Almost surely, 2^66713381 is an apocalyptic number.

It is an amenable number.

66713381 is a deficient number, since it is larger than the sum of its proper divisors (9763483).

66713381 is a wasteful number, since it uses less digits than its factorization.

66713381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29131.

The product of its digits is 18144, while the sum is 35.

The square root of 66713381 is about 8167.8259653350. The cubic root of 66713381 is about 405.5748195960.

The spelling of 66713381 in words is "sixty-six million, seven hundred thirteen thousand, three hundred eighty-one".