26400640563 has 12 divisors (see below), whose sum is σ = 41601009528. Its totient is φ = 16000388160.

The previous prime is 26400640547. The next prime is 26400640571. The reversal of 26400640563 is 36504600462.

26400640563 is a `hidden beast` number, since 2 + 6 + 4 + 0 + 0 + 640 + 5 + 6 + 3 = 666.

It is not a de Polignac number, because 26400640563 - 2⁴ = 26400640547 is a prime.

It is a super-4 number, since 4×26400640563⁴ (a number of 43 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (26400640523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133336470 + ... + 133336667.

It is an arithmetic number, because the mean of its divisors is an integer number (3466750794).

Almost surely, 2^26400640563 is an apocalyptic number.

26400640563 is a deficient number, since it is larger than the sum of its proper divisors (15200368965).

26400640563 is a wasteful number, since it uses less digits than its factorization.

26400640563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266673154 (or 266673151 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The spelling of 26400640563 in words is "twenty-six billion, four hundred million, six hundred forty thousand, five hundred sixty-three".