26561245020 has 48 divisors (see below), whose sum is σ = 77605032960. Its totient is φ = 6775041856.

The previous prime is 26561244929. The next prime is 26561245103. The reversal of 26561245020 is 2054216562.

It is a congruent number.

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, 9622260 + ... + 9625019.

It is an arithmetic number, because the mean of its divisors is an integer number (1616771520).

Almost surely, 2^26561245020 is an apocalyptic number.

26561245020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26561245020 is an abundant number, since it is smaller than the sum of its proper divisors (51043787940).

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

26561245020 is a wasteful number, since it uses less digits than its factorization.

26561245020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19247314 (or 19247312 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 26561245020 in words is "twenty-six billion, five hundred sixty-one million, two hundred forty-five thousand, twenty".