65799999 has 8 divisors (see below), whose sum is σ = 97481520. Its totient is φ = 43866648.

The previous prime is 65799997. The next prime is 65800001. The reversal of 65799999 is 99999756.

It is an interprime number because it is at equal distance from previous prime (65799997) and next prime (65800001).

It is not a de Polignac number, because 65799999 - 2¹ = 65799997 is a prime.

65799999 is a modest number, since divided by 9999 gives 6579 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65799991) 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, 1218492 + ... + 1218545.

It is an arithmetic number, because the mean of its divisors is an integer number (12185190).

Almost surely, 2^65799999 is an apocalyptic number.

65799999 is a deficient number, since it is larger than the sum of its proper divisors (31681521).

65799999 is a wasteful number, since it uses less digits than its factorization.

65799999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2437046 (or 2437040 counting only the distinct ones).

The product of its digits is 12400290, while the sum is 63.

The square root of 65799999 is about 8111.7198546301. The cubic root of 65799999 is about 403.7153809294.

The spelling of 65799999 in words is "sixty-five million, seven hundred ninety-nine thousand, nine hundred ninety-nine".