4158521431681 has 4 divisors (see below), whose sum is σ = 4186061308864. Its totient is φ = 4130981554500.

The previous prime is 4158521431609. The next prime is 4158521431751. The reversal of 4158521431681 is 1861341258514.

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 a de Polignac number, because none of the positive numbers 2^k-4158521431681 is a prime.

It is a super-2 number, since 2×4158521431681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4158521431601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13769938365 + ... + 13769938666.

It is an arithmetic number, because the mean of its divisors is an integer number (1046515327216).

Almost surely, 2^{4158521431681} is an apocalyptic number.

It is an amenable number.

4158521431681 is a deficient number, since it is larger than the sum of its proper divisors (27539877183).

4158521431681 is a wasteful number, since it uses less digits than its factorization.

4158521431681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27539877182.

The product of its digits is 921600, while the sum is 49.

The spelling of 4158521431681 in words is "four trillion, one hundred fifty-eight billion, five hundred twenty-one million, four hundred thirty-one thousand, six hundred eighty-one".