65800381 has 4 divisors (see below), whose sum is σ = 65829600. Its totient is φ = 65771164.

The previous prime is 65800379. The next prime is 65800409. The reversal of 65800381 is 18300856.

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 65800381 - 2¹ = 65800379 is a prime.

It is a super-2 number, since 2×65800381² = 8659380279490322, 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 (65800181) 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, 10921 + ... + 15838.

It is an arithmetic number, because the mean of its divisors is an integer number (16457400).

Almost surely, 2^65800381 is an apocalyptic number.

It is an amenable number.

65800381 is a deficient number, since it is larger than the sum of its proper divisors (29219).

65800381 is a wasteful number, since it uses less digits than its factorization.

65800381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29218.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 65800381 is about 8111.7434007740. The cubic root of 65800381 is about 403.7161621806.

The spelling of 65800381 in words is "sixty-five million, eight hundred thousand, three hundred eighty-one".