215983921273061 has 4 divisors (see below), whose sum is σ = 223431642696300. Its totient is φ = 208536199849824.

The previous prime is 215983921273033. The next prime is 215983921273067. The reversal of 215983921273061 is 160372129389512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50740120704100 + 165243800568961 = 7123210^2 + 12854719^2 .

It is a cyclic number.

It is not a de Polignac number, because 215983921273061 - 2¹⁰ = 215983921272037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215983921273067) 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, 3723860711576 + ... + 3723860711633.

It is an arithmetic number, because the mean of its divisors is an integer number (55857910674075).

Almost surely, 2^{215983921273061} is an apocalyptic number.

It is an amenable number.

215983921273061 is a deficient number, since it is larger than the sum of its proper divisors (7447721423239).

215983921273061 is an equidigital number, since it uses as much as digits as its factorization.

215983921273061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7447721423238.

The product of its (nonzero) digits is 9797760, while the sum is 59.

The spelling of 215983921273061 in words is "two hundred fifteen trillion, nine hundred eighty-three billion, nine hundred twenty-one million, two hundred seventy-three thousand, sixty-one".