2109901637485 has 4 divisors (see below), whose sum is σ = 2531881964988. Its totient is φ = 1687921309984.

The previous prime is 2109901637483. The next prime is 2109901637489. The reversal of 2109901637485 is 5847361099012.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 571738625956 + 1538163011529 = 756134^2 + 1240227^2 .

It is a cyclic number.

It is not a de Polignac number, because 2109901637485 - 2¹ = 2109901637483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2109901637483) 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, 210990163744 + ... + 210990163753.

It is an arithmetic number, because the mean of its divisors is an integer number (632970491247).

It is a 1-persistent number, because it is pandigital, but 2⋅2109901637485 = 4219803274970 is not.

Almost surely, 2^{2109901637485} is an apocalyptic number.

It is an amenable number.

2109901637485 is a deficient number, since it is larger than the sum of its proper divisors (421980327503).

2109901637485 is an equidigital number, since it uses as much as digits as its factorization.

2109901637485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421980327502.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 2109901637485 in words is "two trillion, one hundred nine billion, nine hundred one million, six hundred thirty-seven thousand, four hundred eighty-five".