26545421643 has 16 divisors (see below), whose sum is σ = 39430866720. Its totient is φ = 15772345344.

The previous prime is 26545421633. The next prime is 26545421653. The reversal of 26545421643 is 34612454562.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (26545421633) and next prime (26545421653).

It is not a de Polignac number, because 26545421643 - 2⁴ = 26545421627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26545421595 and 26545421604.

It is not an unprimeable number, because it can be changed into a prime (26545421633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11734246 + ... + 11736507.

It is an arithmetic number, because the mean of its divisors is an integer number (2464429170).

Almost surely, 2^26545421643 is an apocalyptic number.

26545421643 is a deficient number, since it is larger than the sum of its proper divisors (12885445077).

26545421643 is a wasteful number, since it uses less digits than its factorization.

26545421643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23470798.

The product of its digits is 691200, while the sum is 42.

The spelling of 26545421643 in words is "twenty-six billion, five hundred forty-five million, four hundred twenty-one thousand, six hundred forty-three".