26456663640 has 64 divisors (see below), whose sum is σ = 86585448960. Its totient is φ = 6413736320.

The previous prime is 26456663603. The next prime is 26456663641. The reversal of 26456663640 is 4636665462.

It is a self number, because there is not a number n which added to its sum of digits gives 26456663640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26456663641) 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, 10020144 + ... + 10022783.

It is an arithmetic number, because the mean of its divisors is an integer number (1352897640).

Almost surely, 2^26456663640 is an apocalyptic number.

26456663640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26456663640 is an abundant number, since it is smaller than the sum of its proper divisors (60128785320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26456663640 is a wasteful number, since it uses less digits than its factorization.

26456663640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20042952 (or 20042948 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 48.

It can be divided in two parts, 26456 and 663640, that added together give a palindrome (690096).

The spelling of 26456663640 in words is "twenty-six billion, four hundred fifty-six million, six hundred sixty-three thousand, six hundred forty".