53720382181 has 8 divisors (see below), whose sum is σ = 54294647960. Its totient is φ = 53146533888.

The previous prime is 53720382173. The next prime is 53720382223. The reversal of 53720382181 is 18128302735.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5214284100 + 48506098081 = 72210^2 + 220241^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 53720382181 - 2³ = 53720382173 is a prime.

It is a super-2 number, since 2×53720382181² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53720382161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157855 + ... + 363811.

It is an arithmetic number, because the mean of its divisors is an integer number (6786830995).

Almost surely, 2^53720382181 is an apocalyptic number.

It is an amenable number.

53720382181 is a deficient number, since it is larger than the sum of its proper divisors (574265779).

53720382181 is a wasteful number, since it uses less digits than its factorization.

53720382181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208743.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 53720382181 in words is "fifty-three billion, seven hundred twenty million, three hundred eighty-two thousand, one hundred eighty-one".