65145919 has 4 divisors (see below), whose sum is σ = 67392360. Its totient is φ = 62899480.

The previous prime is 65145917. The next prime is 65145967. The reversal of 65145919 is 91954156.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65145919 - 2¹ = 65145917 is a prime.

It is a super-2 number, since 2×65145919² = 8487981524709122, 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 (65145917) 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, 1123177 + ... + 1123234.

It is an arithmetic number, because the mean of its divisors is an integer number (16848090).

Almost surely, 2^65145919 is an apocalyptic number.

65145919 is a deficient number, since it is larger than the sum of its proper divisors (2246441).

65145919 is a wasteful number, since it uses less digits than its factorization.

65145919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246440.

The product of its digits is 48600, while the sum is 40.

The square root of 65145919 is about 8071.3021873797. The cubic root of 65145919 is about 402.3732229355.

The spelling of 65145919 in words is "sixty-five million, one hundred forty-five thousand, nine hundred nineteen".