20135494370819 has 2 divisors, whose sum is σ = 20135494370820. Its totient is φ = 20135494370818.

The previous prime is 20135494370773. The next prime is 20135494370867. The reversal of 20135494370819 is 91807349453102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20135494370819 - 2¹² = 20135494366723 is a prime.

It is a super-2 number, since 2×20135494370819² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20135494370879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10067747185409 + 10067747185410.

It is an arithmetic number, because the mean of its divisors is an integer number (10067747185410).

Almost surely, 2^{20135494370819} is an apocalyptic number.

20135494370819 is a deficient number, since it is larger than the sum of its proper divisors (1).

20135494370819 is an equidigital number, since it uses as much as digits as its factorization.

20135494370819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 20135494370819 in words is "twenty trillion, one hundred thirty-five billion, four hundred ninety-four million, three hundred seventy thousand, eight hundred nineteen".