215494087505 has 4 divisors (see below), whose sum is σ = 258592905012. Its totient is φ = 172395270000.

The previous prime is 215494087483. The next prime is 215494087511. The reversal of 215494087505 is 505780494512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 84035632321 + 131458455184 = 289889^2 + 362572^2 .

It is not a de Polignac number, because 215494087505 - 2¹⁰ = 215494086481 is a prime.

It is a super-2 number, since 2×215494087505² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21549408746 + ... + 21549408755.

It is an arithmetic number, because the mean of its divisors is an integer number (64648226253).

Almost surely, 2^215494087505 is an apocalyptic number.

It is an amenable number.

215494087505 is a deficient number, since it is larger than the sum of its proper divisors (43098817507).

215494087505 is an equidigital number, since it uses as much as digits as its factorization.

215494087505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43098817506.

The product of its (nonzero) digits is 2016000, while the sum is 50.

The spelling of 215494087505 in words is "two hundred fifteen billion, four hundred ninety-four million, eighty-seven thousand, five hundred five".