650721676121 has 16 divisors (see below), whose sum is σ = 721565150208. Its totient is φ = 581827363200.

The previous prime is 650721676093. The next prime is 650721676127. The reversal of 650721676121 is 121676127056.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-650721676121 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650721676127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14358920 + ... + 14404166.

It is an arithmetic number, because the mean of its divisors is an integer number (45097821888).

Almost surely, 2^650721676121 is an apocalyptic number.

650721676121 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

650721676121 is a deficient number, since it is larger than the sum of its proper divisors (70843474087).

650721676121 is a wasteful number, since it uses less digits than its factorization.

650721676121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66752.

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 650721676121 in words is "six hundred fifty billion, seven hundred twenty-one million, six hundred seventy-six thousand, one hundred twenty-one".