2156135541365 has 8 divisors (see below), whose sum is σ = 2786390545848. Its totient is φ = 1592223168960.

The previous prime is 2156135541337. The next prime is 2156135541379. The reversal of 2156135541365 is 5631455316512.

It can be written as a sum of positive squares in 4 ways, for example, as 25262559364 + 2130872982001 = 158942^2 + 1459751^2 .

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

It is not a de Polignac number, because 2156135541365 - 2¹⁶ = 2156135475829 is a prime.

It is a super-4 number, since 4×2156135541365⁴ (a number of 50 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16585657946 + ... + 16585658075.

It is an arithmetic number, because the mean of its divisors is an integer number (348298818231).

Almost surely, 2^{2156135541365} is an apocalyptic number.

It is an amenable number.

2156135541365 is a deficient number, since it is larger than the sum of its proper divisors (630255004483).

2156135541365 is a wasteful number, since it uses less digits than its factorization.

2156135541365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33171316039.

The product of its digits is 1620000, while the sum is 47.

The spelling of 2156135541365 in words is "two trillion, one hundred fifty-six billion, one hundred thirty-five million, five hundred forty-one thousand, three hundred sixty-five".