65995779958 has 4 divisors (see below), whose sum is σ = 98993669940. Its totient is φ = 32997889978.

The previous prime is 65995779953. The next prime is 65995779959. The reversal of 65995779958 is 85997759956.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65995779953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16498944988 + ... + 16498944991.

It is an arithmetic number, because the mean of its divisors is an integer number (24748417485).

Almost surely, 2^65995779958 is an apocalyptic number.

65995779958 is a deficient number, since it is larger than the sum of its proper divisors (32997889982).

65995779958 is a wasteful number, since it uses less digits than its factorization.

65995779958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32997889981.

The product of its digits is 1928934000, while the sum is 79.

The spelling of 65995779958 in words is "sixty-five billion, nine hundred ninety-five million, seven hundred seventy-nine thousand, nine hundred fifty-eight".