258421820641 has 6 divisors (see below), whose sum is σ = 258499684070. Its totient is φ = 258343979136.

The previous prime is 258421820617. The next prime is 258421820711. The reversal of 258421820641 is 146028124852.

It can be written as a sum of positive squares in 3 ways, for example, as 46818140625 + 211603680016 = 216375^2 + 460004^2 .

It is not a de Polignac number, because 258421820641 - 2⁷ = 258421820513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (258421821641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19858345 + ... + 19871353.

Almost surely, 2^258421820641 is an apocalyptic number.

It is an amenable number.

258421820641 is a deficient number, since it is larger than the sum of its proper divisors (77863429).

258421820641 is an frugal number, since it uses more digits than its factorization.

258421820641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21923 (or 17466 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 43.

The spelling of 258421820641 in words is "two hundred fifty-eight billion, four hundred twenty-one million, eight hundred twenty thousand, six hundred forty-one".