66295381 has 4 divisors (see below), whose sum is σ = 66915072. Its totient is φ = 65675692.

The previous prime is 66295373. The next prime is 66295387. The reversal of 66295381 is 18359266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66295381 - 2³ = 66295373 is a prime.

It is a super-2 number, since 2×66295381² = 8790155083870322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66295387) 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, 309685 + ... + 309898.

It is an arithmetic number, because the mean of its divisors is an integer number (16728768).

Almost surely, 2^66295381 is an apocalyptic number.

It is an amenable number.

66295381 is a deficient number, since it is larger than the sum of its proper divisors (619691).

66295381 is a wasteful number, since it uses less digits than its factorization.

66295381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619690.

The product of its digits is 77760, while the sum is 40.

The square root of 66295381 is about 8142.1975534864. The cubic root of 66295381 is about 404.7259864741.

The spelling of 66295381 in words is "sixty-six million, two hundred ninety-five thousand, three hundred eighty-one".