4250666561 has 4 divisors (see below), whose sum is σ = 4397241300. Its totient is φ = 4104091824.

The previous prime is 4250666543. The next prime is 4250666579. The reversal of 4250666561 is 1656660524.

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

It is an interprime number because it is at equal distance from previous prime (4250666543) and next prime (4250666579).

It can be written as a sum of positive squares in 2 ways, for example, as 1776201025 + 2474465536 = 42145^2 + 49744^2 .

It is a cyclic number.

It is not a de Polignac number, because 4250666561 - 2¹⁴ = 4250650177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4250668561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73287326 + ... + 73287383.

It is an arithmetic number, because the mean of its divisors is an integer number (1099310325).

Almost surely, 2^4250666561 is an apocalyptic number.

It is an amenable number.

4250666561 is a deficient number, since it is larger than the sum of its proper divisors (146574739).

4250666561 is a wasteful number, since it uses less digits than its factorization.

4250666561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146574738.

The product of its (nonzero) digits is 259200, while the sum is 41.

The square root of 4250666561 is about 65197.1361410914. The cubic root of 4250666561 is about 1619.8905785211.

The spelling of 4250666561 in words is "four billion, two hundred fifty million, six hundred sixty-six thousand, five hundred sixty-one".