215415199973 has 2 divisors, whose sum is σ = 215415199974. Its totient is φ = 215415199972.

The previous prime is 215415199963. The next prime is 215415200017. The reversal of 215415199973 is 379991514512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113834036449 + 101581163524 = 337393^2 + 318718^2 .

It is a cyclic number.

It is not a de Polignac number, because 215415199973 - 2¹⁴ = 215415183589 is a prime.

It is a super-4 number, since 4×215415199973⁴ (a number of 46 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215415199903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107707599986 + 107707599987.

It is an arithmetic number, because the mean of its divisors is an integer number (107707599987).

Almost surely, 2^215415199973 is an apocalyptic number.

It is an amenable number.

215415199973 is a deficient number, since it is larger than the sum of its proper divisors (1).

215415199973 is an equidigital number, since it uses as much as digits as its factorization.

215415199973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3061800, while the sum is 56.

The spelling of 215415199973 in words is "two hundred fifteen billion, four hundred fifteen million, one hundred ninety-nine thousand, nine hundred seventy-three".