26621858258 has 18 divisors (see below), whose sum is σ = 40328801487. Its totient is φ = 13180211520.

The previous prime is 26621858257. The next prime is 26621858273. The reversal of 26621858258 is 85285812662.

It can be written as a sum of positive squares in 5 ways, for example, as 1218917569 + 25402940689 = 34913^2 + 159383^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=115373.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26621858257) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26073788 + ... + 26074808.

Almost surely, 2^26621858258 is an apocalyptic number.

26621858258 is a deficient number, since it is larger than the sum of its proper divisors (13706943229).

26621858258 is an frugal number, since it uses more digits than its factorization.

26621858258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270 (or 1136 counting only the distinct ones).

The product of its digits is 3686400, while the sum is 53.

The spelling of 26621858258 in words is "twenty-six billion, six hundred twenty-one million, eight hundred fifty-eight thousand, two hundred fifty-eight".