2155536238081 has 8 divisors (see below), whose sum is σ = 2178921156104. Its totient is φ = 2132175052800.

The previous prime is 2155536238069. The next prime is 2155536238099. The reversal of 2155536238081 is 1808326355512.

It can be written as a sum of positive squares in 4 ways, for example, as 239551513600 + 1915984724481 = 489440^2 + 1384191^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155536238081 is a prime.

It is a super-2 number, since 2×2155536238081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155536238001) 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, 5750520 + ... + 6113881.

It is an arithmetic number, because the mean of its divisors is an integer number (272365144513).

Almost surely, 2^{2155536238081} is an apocalyptic number.

It is an amenable number.

2155536238081 is a deficient number, since it is larger than the sum of its proper divisors (23384918023).

2155536238081 is a wasteful number, since it uses less digits than its factorization.

2155536238081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11866371.

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 2155536238081 in words is "two trillion, one hundred fifty-five billion, five hundred thirty-six million, two hundred thirty-eight thousand, eighty-one".