215736643093 has 2 divisors, whose sum is σ = 215736643094. Its totient is φ = 215736643092.

The previous prime is 215736643079. The next prime is 215736643103. The reversal of 215736643093 is 390346637512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208503650884 + 7232992209 = 456622^2 + 85047^2 .

It is a cyclic number.

It is not a de Polignac number, because 215736643093 - 2²⁵ = 215703088661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215736643043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107868321546 + 107868321547.

It is an arithmetic number, because the mean of its divisors is an integer number (107868321547).

Almost surely, 2^215736643093 is an apocalyptic number.

It is an amenable number.

215736643093 is a deficient number, since it is larger than the sum of its proper divisors (1).

215736643093 is an equidigital number, since it uses as much as digits as its factorization.

215736643093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 49.

It can be divided in two parts, 21573 and 6643093, that added together give a palindrome (6664666).

The spelling of 215736643093 in words is "two hundred fifteen billion, seven hundred thirty-six million, six hundred forty-three thousand, ninety-three".