13250820645 has 32 divisors (see below), whose sum is σ = 23600211840. Its totient is φ = 7054145280.

The previous prime is 13250820623. The next prime is 13250820691. The reversal of 13250820645 is 54602805231.

13250820645 is a `hidden beast` number, since 1 + 3 + 2 + 5 + 0 + 8 + 2 + 0 + 645 = 666.

It is not a de Polignac number, because 13250820645 - 2⁵ = 13250820613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15876 + ... + 163565.

It is an arithmetic number, because the mean of its divisors is an integer number (737506620).

Almost surely, 2^13250820645 is an apocalyptic number.

13250820645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13250820645 is a deficient number, since it is larger than the sum of its proper divisors (10349391195).

13250820645 is a wasteful number, since it uses less digits than its factorization.

13250820645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180002 (or 179996 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 13250820645 in words is "thirteen billion, two hundred fifty million, eight hundred twenty thousand, six hundred forty-five".