26405430405 has 32 divisors (see below), whose sum is σ = 44912672640. Its totient is φ = 13209580800.

The previous prime is 26405430383. The next prime is 26405430433. The reversal of 26405430405 is 50403450462.

It is not a de Polignac number, because 26405430405 - 2³⁴ = 9225561221 is a prime.

It is a super-3 number, since 3×26405430405³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 429882 + ... + 487451.

It is an arithmetic number, because the mean of its divisors is an integer number (1403521020).

Almost surely, 2^26405430405 is an apocalyptic number.

It is an amenable number.

26405430405 is a deficient number, since it is larger than the sum of its proper divisors (18507242235).

26405430405 is a wasteful number, since it uses less digits than its factorization.

26405430405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917461.

The product of its (nonzero) digits is 57600, while the sum is 33.

Adding to 26405430405 its reverse (50403450462), we get a palindrome (76808880867).

The spelling of 26405430405 in words is "twenty-six billion, four hundred five million, four hundred thirty thousand, four hundred five".