65994643 has 16 divisors (see below), whose sum is σ = 79634016. Its totient is φ = 53879040.

The previous prime is 65994641. The next prime is 65994667. The reversal of 65994643 is 34649956.

It is a cyclic number.

It is not a de Polignac number, because 65994643 - 2¹ = 65994641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65994593 and 65994602.

It is not an unprimeable number, because it can be changed into a prime (65994641) 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, 946 + ... + 11527.

It is an arithmetic number, because the mean of its divisors is an integer number (4977126).

Almost surely, 2^65994643 is an apocalyptic number.

65994643 is a deficient number, since it is larger than the sum of its proper divisors (13639373).

65994643 is a wasteful number, since it uses less digits than its factorization.

65994643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12534.

The product of its digits is 699840, while the sum is 46.

The square root of 65994643 is about 8123.7086973869. The cubic root of 65994643 is about 404.1130679670.

The spelling of 65994643 in words is "sixty-five million, nine hundred ninety-four thousand, six hundred forty-three".