13220865735 has 128 divisors (see below), whose sum is σ = 26775650304. Its totient is φ = 5411266560.

The previous prime is 13220865733. The next prime is 13220865739. The reversal of 13220865735 is 53756802231.

It is a happy number.

It is not a de Polignac number, because 13220865735 - 2¹ = 13220865733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220865731) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 28309972 + ... + 28310438.

It is an arithmetic number, because the mean of its divisors is an integer number (209184768).

Almost surely, 2^13220865735 is an apocalyptic number.

13220865735 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13220865735 is an abundant number, since it is smaller than the sum of its proper divisors (13554784569).

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

13220865735 is a wasteful number, since it uses less digits than its factorization.

13220865735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813.

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 13220865735 in words is "thirteen billion, two hundred twenty million, eight hundred sixty-five thousand, seven hundred thirty-five".