64165381 has 8 divisors (see below), whose sum is σ = 75697664. Its totient is φ = 53224560.

The previous prime is 64165379. The next prime is 64165397. The reversal of 64165381 is 18356146.

It is a happy number.

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 64165381 - 2¹ = 64165379 is a prime.

It is a super-2 number, since 2×64165381² = 8234392237750322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64162381) 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, 147630 + ... + 148063.

It is an arithmetic number, because the mean of its divisors is an integer number (9462208).

Almost surely, 2^64165381 is an apocalyptic number.

It is an amenable number.

64165381 is a deficient number, since it is larger than the sum of its proper divisors (11532283).

64165381 is a wasteful number, since it uses less digits than its factorization.

64165381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295731.

The product of its digits is 17280, while the sum is 34.

The square root of 64165381 is about 8010.3296436539. The cubic root of 64165381 is about 400.3442473993.

It can be divided in two parts, 64165 and 381, that added together give a palindrome (64546).

The spelling of 64165381 in words is "sixty-four million, one hundred sixty-five thousand, three hundred eighty-one".