215055056706991 has 2 divisors, whose sum is σ = 215055056706992. Its totient is φ = 215055056706990.

The previous prime is 215055056706983. The next prime is 215055056707013. The reversal of 215055056706991 is 199607650550512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215055056706991 - 2³ = 215055056706983 is a prime.

It is a super-2 number, since 2×215055056706991² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215055056707991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107527528353495 + 107527528353496.

It is an arithmetic number, because the mean of its divisors is an integer number (107527528353496).

Almost surely, 2^{215055056706991} is an apocalyptic number.

215055056706991 is a deficient number, since it is larger than the sum of its proper divisors (1).

215055056706991 is an equidigital number, since it uses as much as digits as its factorization.

215055056706991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25515000, while the sum is 61.

The spelling of 215055056706991 in words is "two hundred fifteen trillion, fifty-five billion, fifty-six million, seven hundred six thousand, nine hundred ninety-one".