2009975645 has 8 divisors (see below), whose sum is σ = 2495142360. Its totient is φ = 1552532800.

The previous prime is 2009975641. The next prime is 2009975651. The reversal of 2009975645 is 5465799002.

It can be written as a sum of positive squares in 4 ways, for example, as 458088409 + 1551887236 = 21403^2 + 39394^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2009975645 - 2² = 2009975641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2009975645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2009975641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6930806 + ... + 6931095.

It is an arithmetic number, because the mean of its divisors is an integer number (311892795).

Almost surely, 2^2009975645 is an apocalyptic number.

It is an amenable number.

2009975645 is a deficient number, since it is larger than the sum of its proper divisors (485166715).

2009975645 is a wasteful number, since it uses less digits than its factorization.

2009975645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13861935.

The product of its (nonzero) digits is 680400, while the sum is 47.

The square root of 2009975645 is about 44832.7519231198. The cubic root of 2009975645 is about 1262.0123309466.

The spelling of 2009975645 in words is "two billion, nine million, nine hundred seventy-five thousand, six hundred forty-five".