2194771138577 has 4 divisors (see below), whose sum is σ = 2194817181876. Its totient is φ = 2194725095280.

The previous prime is 2194771138543. The next prime is 2194771138603. The reversal of 2194771138577 is 7758311774912.

It is a Cunningham number, because it is equal to 1481476²+1.

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 614317358656 + 1580453779921 = 783784^2 + 1257161^2 .

It is a cyclic number.

It is not a de Polignac number, because 2194771138577 - 2¹² = 2194771134481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2194771138537) 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, 22950074 + ... + 23045507.

It is an arithmetic number, because the mean of its divisors is an integer number (548704295469).

Almost surely, 2^{2194771138577} is an apocalyptic number.

It is an amenable number.

2194771138577 is a deficient number, since it is larger than the sum of its proper divisors (46043299).

2194771138577 is an equidigital number, since it uses as much as digits as its factorization.

2194771138577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46043298.

The product of its digits is 20744640, while the sum is 62.

The spelling of 2194771138577 in words is "two trillion, one hundred ninety-four billion, seven hundred seventy-one million, one hundred thirty-eight thousand, five hundred seventy-seven".