26405287641 has 24 divisors (see below), whose sum is σ = 38258700480. Its totient is φ = 17549258400.

The previous prime is 26405287603. The next prime is 26405287661. The reversal of 26405287641 is 14678250462.

26405287641 is a `hidden beast` number, since 2 + 64 + 0 + 528 + 7 + 64 + 1 = 666.

It is not a de Polignac number, because 26405287641 - 2¹⁰ = 26405286617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26405287661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7627651 + ... + 7631111.

It is an arithmetic number, because the mean of its divisors is an integer number (1594112520).

Almost surely, 2^26405287641 is an apocalyptic number.

It is an amenable number.

26405287641 is a deficient number, since it is larger than the sum of its proper divisors (11853412839).

26405287641 is a wasteful number, since it uses less digits than its factorization.

26405287641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5837 (or 5834 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 26405287641 in words is "twenty-six billion, four hundred five million, two hundred eighty-seven thousand, six hundred forty-one".