215256877049 has 2 divisors, whose sum is σ = 215256877050. Its totient is φ = 215256877048.

The previous prime is 215256876983. The next prime is 215256877081. The reversal of 215256877049 is 940778652512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204084387049 + 11172490000 = 451757^2 + 105700^2 .

It is a cyclic number.

It is not a de Polignac number, because 215256877049 - 2¹⁶ = 215256811513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 215256876985 and 215256877003.

It is not a weakly prime, because it can be changed into another prime (215256817049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107628438524 + 107628438525.

It is an arithmetic number, because the mean of its divisors is an integer number (107628438525).

Almost surely, 2^215256877049 is an apocalyptic number.

It is an amenable number.

215256877049 is a deficient number, since it is larger than the sum of its proper divisors (1).

215256877049 is an equidigital number, since it uses as much as digits as its factorization.

215256877049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 215256877049 in words is "two hundred fifteen billion, two hundred fifty-six million, eight hundred seventy-seven thousand, forty-nine".