4909121665 has 16 divisors (see below), whose sum is σ = 6799173120. Its totient is φ = 3332923200.

The previous prime is 4909121663. The next prime is 4909121669. The reversal of 4909121665 is 5661219094.

It is not a de Polignac number, because 4909121665 - 2¹ = 4909121663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4909121663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 690825 + ... + 697894.

It is an arithmetic number, because the mean of its divisors is an integer number (424948320).

Almost surely, 2^4909121665 is an apocalyptic number.

It is an amenable number.

4909121665 is a deficient number, since it is larger than the sum of its proper divisors (1890051455).

4909121665 is a wasteful number, since it uses less digits than its factorization.

4909121665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388832.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 4909121665 is about 70065.1244557519. The cubic root of 4909121665 is about 1699.5525540980.

It can be divided in two parts, 49091 and 21665, that added together give a square (70756 = 266²).

The spelling of 4909121665 in words is "four billion, nine hundred nine million, one hundred twenty-one thousand, six hundred sixty-five".