26660722240 has 28 divisors (see below), whose sum is σ = 63485845596. Its totient is φ = 10664288768.

The previous prime is 26660722211. The next prime is 26660722261. The reversal of 26660722240 is 4222706662.

It can be written as a sum of positive squares in 2 ways, for example, as 12013913664 + 14646808576 = 109608^2 + 121024^2 .

It is a super-2 number, since 2×26660722240² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26660722240.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41657059 + ... + 41657698.

Almost surely, 2^26660722240 is an apocalyptic number.

26660722240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26660722240 is an abundant number, since it is smaller than the sum of its proper divisors (36825123356).

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

26660722240 is an equidigital number, since it uses as much as digits as its factorization.

26660722240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83314774 (or 83314764 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 37.

The spelling of 26660722240 in words is "twenty-six billion, six hundred sixty million, seven hundred twenty-two thousand, two hundred forty".