26661254400 has 648 divisors, whose sum is σ = 107645297760. Its totient is φ = 6236160000.

The previous prime is 26661254383. The next prime is 26661254401. The reversal of 26661254400 is 445216662.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26661254401) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 18373675 + ... + 18375125.

Almost surely, 2^26661254400 is an apocalyptic number.

26661254400 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 26661254400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53822648880).

26661254400 is an abundant number, since it is smaller than the sum of its proper divisors (80984043360).

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

26661254400 is a wasteful number, since it uses less digits than its factorization.

26661254400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523 (or 1501 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 26661254400 in words is "twenty-six billion, six hundred sixty-one million, two hundred fifty-four thousand, four hundred".