19975007813 has 4 divisors (see below), whose sum is σ = 19982373228. Its totient is φ = 19967642400.

The previous prime is 19975007807. The next prime is 19975007861. The reversal of 19975007813 is 31870057991.

19975007813 = 99937² + 99938².

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 9987403969 + 9987603844 = 99937^2 + 99938^2 .

It is a cyclic number.

It is not a de Polignac number, because 19975007813 - 2¹⁴ = 19974991429 is a prime.

It is a super-2 number, since 2×19975007813² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19975037813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3678638 + ... + 3684063.

It is an arithmetic number, because the mean of its divisors is an integer number (4995593307).

Almost surely, 2^19975007813 is an apocalyptic number.

19975007813 is the 99938-th centered square number.

It is an amenable number.

19975007813 is a deficient number, since it is larger than the sum of its proper divisors (7365415).

19975007813 is an equidigital number, since it uses as much as digits as its factorization.

19975007813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7365414.

The product of its (nonzero) digits is 476280, while the sum is 50.

The spelling of 19975007813 in words is "nineteen billion, nine hundred seventy-five million, seven thousand, eight hundred thirteen".