215051206705 has 4 divisors (see below), whose sum is σ = 258061448052. Its totient is φ = 172040965360.

The previous prime is 215051206687. The next prime is 215051206723. The reversal of 215051206705 is 507602150512.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (215051206687) and next prime (215051206723).

It can be written as a sum of positive squares in 2 ways, for example, as 25676537121 + 189374669584 = 160239^2 + 435172^2 .

It is not a de Polignac number, because 215051206705 - 2¹⁷ = 215051075633 is a prime.

It is a super-3 number, since 3×215051206705³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21505120666 + ... + 21505120675.

It is an arithmetic number, because the mean of its divisors is an integer number (64515362013).

Almost surely, 2^215051206705 is an apocalyptic number.

It is an amenable number.

215051206705 is a deficient number, since it is larger than the sum of its proper divisors (43010241347).

215051206705 is an equidigital number, since it uses as much as digits as its factorization.

215051206705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43010241346.

The product of its (nonzero) digits is 21000, while the sum is 34.

The spelling of 215051206705 in words is "two hundred fifteen billion, fifty-one million, two hundred six thousand, seven hundred five".