26600646420 has 36 divisors (see below), whose sum is σ = 80688628020. Its totient is φ = 7093505664.

The previous prime is 26600646403. The next prime is 26600646427. The reversal of 26600646420 is 2464600662.

26600646420 is a `hidden beast` number, since 2 + 6 + 6 + 0 + 0 + 6 + 4 + 642 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11177987076 + 15422659344 = 105726^2 + 124188^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 (26600646427) 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, 73890505 + ... + 73890864.

Almost surely, 2^26600646420 is an apocalyptic number.

26600646420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26600646420 is an abundant number, since it is smaller than the sum of its proper divisors (54087981600).

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

26600646420 is a wasteful number, since it uses less digits than its factorization.

26600646420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147781384 (or 147781379 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The spelling of 26600646420 in words is "twenty-six billion, six hundred million, six hundred forty-six thousand, four hundred twenty".