201161778813 has 6 divisors (see below), whose sum is σ = 290567013854. Its totient is φ = 134107852536.

The previous prime is 201161778761. The next prime is 201161778823. The reversal of 201161778813 is 318877161102.

201161778813 is a `hidden beast` number, since 2 + 0 + 11 + 617 + 7 + 8 + 8 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 201136104324 + 25674489 = 448482^2 + 5067^2 .

It is not a de Polignac number, because 201161778813 - 2¹⁴ = 201161762429 is a prime.

It is a super-2 number, since 2×201161778813² (a number of 23 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 (201161778823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11175654370 + ... + 11175654387.

Almost surely, 2^201161778813 is an apocalyptic number.

It is an amenable number.

201161778813 is a deficient number, since it is larger than the sum of its proper divisors (89405235041).

201161778813 is a wasteful number, since it uses less digits than its factorization.

201161778813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22351308763 (or 22351308760 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The spelling of 201161778813 in words is "two hundred one billion, one hundred sixty-one million, seven hundred seventy-eight thousand, eight hundred thirteen".