65990090699 has 4 divisors (see below), whose sum is σ = 71066251536. Its totient is φ = 60913929864.

The previous prime is 65990090689. The next prime is 65990090729. The reversal of 65990090699 is 99609009956.

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

It is a cyclic number.

It is not a de Polignac number, because 65990090699 - 2⁸ = 65990090443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65990090659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2538080399 + ... + 2538080424.

It is an arithmetic number, because the mean of its divisors is an integer number (17766562884).

Almost surely, 2^65990090699 is an apocalyptic number.

65990090699 is a deficient number, since it is larger than the sum of its proper divisors (5076160837).

65990090699 is a wasteful number, since it uses less digits than its factorization.

65990090699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5076160836.

The product of its (nonzero) digits is 10628820, while the sum is 62.

The spelling of 65990090699 in words is "sixty-five billion, nine hundred ninety million, ninety thousand, six hundred ninety-nine".