65994819 has 16 divisors (see below), whose sum is σ = 96211584. Its totient is φ = 39905600.

The previous prime is 65994781. The next prime is 65994827. The reversal of 65994819 is 91849956.

It is a cyclic number.

It is not a de Polignac number, because 65994819 - 2⁸ = 65994563 is a prime.

It is a super-2 number, since 2×65994819² = 8710632269685522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65994839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14167 + ... + 18239.

It is an arithmetic number, because the mean of its divisors is an integer number (6013224).

Almost surely, 2^65994819 is an apocalyptic number.

65994819 is a deficient number, since it is larger than the sum of its proper divisors (30216765).

65994819 is a wasteful number, since it uses less digits than its factorization.

65994819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578.

The product of its digits is 699840, while the sum is 51.

The square root of 65994819 is about 8123.7195298705. The cubic root of 65994819 is about 404.1134272075.

The spelling of 65994819 in words is "sixty-five million, nine hundred ninety-four thousand, eight hundred nineteen".