190137778813 has 4 divisors (see below), whose sum is σ = 190139027548. Its totient is φ = 190136530080.

The previous prime is 190137778769. The next prime is 190137778837. The reversal of 190137778813 is 318877731091.

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 104217271929 + 85920506884 = 322827^2 + 293122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-190137778813 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 (190137778613) 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, 358128 + ... + 713113.

It is an arithmetic number, because the mean of its divisors is an integer number (47534756887).

Almost surely, 2^190137778813 is an apocalyptic number.

It is an amenable number.

190137778813 is a deficient number, since it is larger than the sum of its proper divisors (1248735).

190137778813 is a wasteful number, since it uses less digits than its factorization.

190137778813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248734.

The product of its (nonzero) digits is 1778112, while the sum is 55.

The spelling of 190137778813 in words is "one hundred ninety billion, one hundred thirty-seven million, seven hundred seventy-eight thousand, eight hundred thirteen".