13505225744639 has 4 divisors (see below), whose sum is σ = 14216027099640. Its totient is φ = 12794424389640.

The previous prime is 13505225744609. The next prime is 13505225744641. The reversal of 13505225744639 is 93644752250531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13505225744639 - 2¹² = 13505225740543 is a prime.

It is a super-2 number, since 2×13505225744639² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13505225744609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355400677472 + ... + 355400677509.

It is an arithmetic number, because the mean of its divisors is an integer number (3554006774910).

Almost surely, 2^{13505225744639} is an apocalyptic number.

13505225744639 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

13505225744639 is a deficient number, since it is larger than the sum of its proper divisors (710801355001).

13505225744639 is an equidigital number, since it uses as much as digits as its factorization.

13505225744639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710801355000.

The product of its (nonzero) digits is 27216000, while the sum is 56.

The spelling of 13505225744639 in words is "thirteen trillion, five hundred five billion, two hundred twenty-five million, seven hundred forty-four thousand, six hundred thirty-nine".