26660656140 has 48 divisors (see below), whose sum is σ = 75594785280. Its totient is φ = 7019513280.

The previous prime is 26660656109. The next prime is 26660656153. The reversal of 26660656140 is 4165606662.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 26660656092 and 26660656101.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2807566 + ... + 2817045.

It is an arithmetic number, because the mean of its divisors is an integer number (1574891360).

Almost surely, 2^26660656140 is an apocalyptic number.

26660656140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26660656140 is an abundant number, since it is smaller than the sum of its proper divisors (48934129140).

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

26660656140 is a wasteful number, since it uses less digits than its factorization.

26660656140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5624702 (or 5624700 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 26660656140 in words is "twenty-six billion, six hundred sixty million, six hundred fifty-six thousand, one hundred forty".