65999999992 has 8 divisors (see below), whose sum is σ = 123750000000. Its totient is φ = 32999999992.

The previous prime is 65999999969. The next prime is 65999999999. The reversal of 65999999992 is 29999999956.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65999999999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4124999992 + ... + 4125000007.

It is an arithmetic number, because the mean of its divisors is an integer number (15468750000).

Almost surely, 2^65999999992 is an apocalyptic number.

It is an amenable number.

65999999992 is a deficient number, since it is larger than the sum of its proper divisors (57750000008).

65999999992 is a wasteful number, since it uses less digits than its factorization.

65999999992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8250000005 (or 8250000001 counting only the distinct ones).

The product of its digits is 2582803260, while the sum is 85.

The spelling of 65999999992 in words is "sixty-five billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-two".