2156511443315 has 4 divisors (see below), whose sum is σ = 2587813731984. Its totient is φ = 1725209154648.

The previous prime is 2156511443311. The next prime is 2156511443329. The reversal of 2156511443315 is 5133441156512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2156511443315 - 2² = 2156511443311 is a prime.

It is a super-3 number, since 3×2156511443315³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156511443311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215651144327 + ... + 215651144336.

It is an arithmetic number, because the mean of its divisors is an integer number (646953432996).

Almost surely, 2^{2156511443315} is an apocalyptic number.

2156511443315 is a deficient number, since it is larger than the sum of its proper divisors (431302288669).

2156511443315 is an equidigital number, since it uses as much as digits as its factorization.

2156511443315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431302288668.

The product of its digits is 216000, while the sum is 41.

Adding to 2156511443315 its reverse (5133441156512), we get a palindrome (7289952599827).

The spelling of 2156511443315 in words is "two trillion, one hundred fifty-six billion, five hundred eleven million, four hundred forty-three thousand, three hundred fifteen".