26519145409 has 3 divisors (see below), whose sum is σ = 26519308257. Its totient is φ = 26518982562.

The previous prime is 26519145407. The next prime is 26519145421. The reversal of 26519145409 is 90454191562.

The square root of 26519145409 is 162847.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 26519145409 - 2¹ = 26519145407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26519145407) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 81424 + ... + 244270.

It is an arithmetic number, because the mean of its divisors is an integer number (8839769419).

Almost surely, 2^26519145409 is an apocalyptic number.

26519145409 is the 162847-th square number.

26519145409 is the 81424-th centered octagonal number.

It is an amenable number.

26519145409 is a deficient number, since it is larger than the sum of its proper divisors (162848).

26519145409 is an frugal number, since it uses more digits than its factorization.

26519145409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325694 (or 162847 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 26519145409 in words is "twenty-six billion, five hundred nineteen million, one hundred forty-five thousand, four hundred nine".