4240166521 has 4 divisors (see below), whose sum is σ = 4463333200. Its totient is φ = 4016999844.

The previous prime is 4240166479. The next prime is 4240166533. The reversal of 4240166521 is 1256610424.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4240166521 - 2¹⁵ = 4240133753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4240466521) 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, 111583311 + ... + 111583348.

It is an arithmetic number, because the mean of its divisors is an integer number (1115833300).

Almost surely, 2^4240166521 is an apocalyptic number.

It is an amenable number.

4240166521 is a deficient number, since it is larger than the sum of its proper divisors (223166679).

4240166521 is a wasteful number, since it uses less digits than its factorization.

4240166521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223166678.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 4240166521 is about 65116.5610348090. The cubic root of 4240166521 is about 1618.5556553134. Note that the first 3 decimals are identical.

Adding to 4240166521 its reverse (1256610424), we get a palindrome (5496776945).

The spelling of 4240166521 in words is "four billion, two hundred forty million, one hundred sixty-six thousand, five hundred twenty-one".