215447946673 has 2 divisors, whose sum is σ = 215447946674. Its totient is φ = 215447946672.

The previous prime is 215447946587. The next prime is 215447946677. The reversal of 215447946673 is 376649744512.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167025063969 + 48422882704 = 408687^2 + 220052^2 .

It is a cyclic number.

It is not a de Polignac number, because 215447946673 - 2¹³ = 215447938481 is a prime.

It is a super-2 number, since 2×215447946673² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215447946677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107723973336 + 107723973337.

It is an arithmetic number, because the mean of its divisors is an integer number (107723973337).

Almost surely, 2^215447946673 is an apocalyptic number.

It is an amenable number.

215447946673 is a deficient number, since it is larger than the sum of its proper divisors (1).

215447946673 is an equidigital number, since it uses as much as digits as its factorization.

215447946673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30481920, while the sum is 58.

The spelling of 215447946673 in words is "two hundred fifteen billion, four hundred forty-seven million, nine hundred forty-six thousand, six hundred seventy-three".