65999958 has 32 divisors (see below), whose sum is σ = 141037440. Its totient is φ = 20528640.

The previous prime is 65999951. The next prime is 65999993. The reversal of 65999958 is 85999956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65999951) 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, 3318 + ... + 11958.

It is an arithmetic number, because the mean of its divisors is an integer number (4407420).

Almost surely, 2^65999958 is an apocalyptic number.

65999958 is an abundant number, since it is smaller than the sum of its proper divisors (75037482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65999958 is a wasteful number, since it uses less digits than its factorization.

65999958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8732.

The product of its digits is 7873200, while the sum is 60.

The square root of 65999958 is about 8124.0358197142. The cubic root of 65999958 is about 404.1239163389.

The spelling of 65999958 in words is "sixty-five million, nine hundred ninety-nine thousand, nine hundred fifty-eight".