2140828865581 has 4 divisors (see below), whose sum is σ = 2446661560672. Its totient is φ = 1834996170492.

The previous prime is 2140828865561. The next prime is 2140828865627. The reversal of 2140828865581 is 1855688280412.

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 2140828865581 - 2⁹ = 2140828865069 is a prime.

It is a super-2 number, since 2×2140828865581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2140828865521) 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, 152916347535 + ... + 152916347548.

It is an arithmetic number, because the mean of its divisors is an integer number (611665390168).

Almost surely, 2^{2140828865581} is an apocalyptic number.

It is an amenable number.

2140828865581 is a deficient number, since it is larger than the sum of its proper divisors (305832695091).

2140828865581 is an equidigital number, since it uses as much as digits as its factorization.

2140828865581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305832695090.

The product of its (nonzero) digits is 9830400, while the sum is 58.

The spelling of 2140828865581 in words is "two trillion, one hundred forty billion, eight hundred twenty-eight million, eight hundred sixty-five thousand, five hundred eighty-one".