99906961650409 has 3 divisors (see below), whose sum is σ = 99906971645757. Its totient is φ = 99906951655062.

The previous prime is 99906961650361. The next prime is 99906961650467. The reversal of 99906961650409 is 90405616960999.

The square root of 99906961650409 is 9995347.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 99906961650409 - 2³¹ = 99904814166761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99906941650409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4997674 + ... + 14993020.

It is an arithmetic number, because the mean of its divisors is an integer number (33302323881919).

Almost surely, 2^{99906961650409} is an apocalyptic number.

99906961650409 is the 9995347-th square number.

99906961650409 is the 4997674-th centered octagonal number.

It is an amenable number.

99906961650409 is a deficient number, since it is larger than the sum of its proper divisors (9995348).

99906961650409 is an frugal number, since it uses more digits than its factorization.

99906961650409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19990694 (or 9995347 counting only the distinct ones).

The product of its (nonzero) digits is 255091680, while the sum is 73.

The spelling of 99906961650409 in words is "ninety-nine trillion, nine hundred six billion, nine hundred sixty-one million, six hundred fifty thousand, four hundred nine".