193835755645081 has 9 divisors (see below), whose sum is σ = 213059304705919. Its totient is φ = 176214184088800.

The previous prime is 193835755645073. The next prime is 193835755645099. The reversal of 193835755645081 is 180546557538391.

The square root of 193835755645081 is 13922491.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 24809085081 + 193810946560000 = 157509^2 + 13921600^2 .

It is not a de Polignac number, because 193835755645081 - 2³ = 193835755645073 is a prime.

It is a super-2 number, since 2×193835755645081² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 193835755645081.

It is not an unprimeable number, because it can be changed into a prime (193835755645001) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 152514561 + ... + 153780241.

Almost surely, 2^{193835755645081} is an apocalyptic number.

193835755645081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

193835755645081 is the 13922491-st square number.

193835755645081 is the 6961246-th centered octagonal number.

It is an amenable number.

193835755645081 is a deficient number, since it is larger than the sum of its proper divisors (19223549060838).

193835755645081 is an frugal number, since it uses more digits than its factorization.

193835755645081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531384 (or 1265692 counting only the distinct ones).

The product of its (nonzero) digits is 544320000, while the sum is 70.

The spelling of 193835755645081 in words is "one hundred ninety-three trillion, eight hundred thirty-five billion, seven hundred fifty-five million, six hundred forty-five thousand, eighty-one".