26651266440 has 128 divisors (see below), whose sum is σ = 80639280000. Its totient is φ = 7046258688.

The previous prime is 26651266429. The next prime is 26651266451. The reversal of 26651266440 is 4466215662.

It is an interprime number because it is at equal distance from previous prime (26651266429) and next prime (26651266451).

It is a junction number, because it is equal to n+sod(n) for n = 26651266392 and 26651266401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13212312 + ... + 13214328.

It is an arithmetic number, because the mean of its divisors is an integer number (629994375).

Almost surely, 2^26651266440 is an apocalyptic number.

26651266440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26651266440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40319640000).

26651266440 is an abundant number, since it is smaller than the sum of its proper divisors (53988013560).

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

26651266440 is a wasteful number, since it uses less digits than its factorization.

26651266440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2919 (or 2915 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 26651266440 in words is "twenty-six billion, six hundred fifty-one million, two hundred sixty-six thousand, four hundred forty".