19523977966013 has 4 divisors (see below), whose sum is σ = 19523987663100. Its totient is φ = 19523968268928.

The previous prime is 19523977965983. The next prime is 19523977966093. The reversal of 19523977966013 is 31066977932591.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9369800586169 + 10154177379844 = 3061013^2 + 3186562^2 .

It is a cyclic number.

It is not a de Polignac number, because 19523977966013 - 2³⁰ = 19522904224189 is a prime.

It is a super-2 number, since 2×19523977966013² (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 (19523977966093) 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, 569870 + ... + 6274767.

It is an arithmetic number, because the mean of its divisors is an integer number (4880996915775).

Almost surely, 2^{19523977966013} is an apocalyptic number.

It is an amenable number.

19523977966013 is a deficient number, since it is larger than the sum of its proper divisors (9697087).

19523977966013 is an equidigital number, since it uses as much as digits as its factorization.

19523977966013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9697086.

The product of its (nonzero) digits is 115736040, while the sum is 68.

The spelling of 19523977966013 in words is "nineteen trillion, five hundred twenty-three billion, nine hundred seventy-seven million, nine hundred sixty-six thousand, thirteen".