215244156005 has 4 divisors (see below), whose sum is σ = 258292987212. Its totient is φ = 172195324800.

The previous prime is 215244155993. The next prime is 215244156011. The reversal of 215244156005 is 500651442512.

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 88645534756 + 126598621249 = 297734^2 + 355807^2 .

It is not a de Polignac number, because 215244156005 - 2⁴ = 215244155989 is a prime.

It is a Duffinian number.

It is a congruent 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, 21524415596 + ... + 21524415605.

It is an arithmetic number, because the mean of its divisors is an integer number (64573246803).

Almost surely, 2^215244156005 is an apocalyptic number.

It is an amenable number.

215244156005 is a deficient number, since it is larger than the sum of its proper divisors (43048831207).

215244156005 is an equidigital number, since it uses as much as digits as its factorization.

215244156005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43048831206.

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 215244156005 its reverse (500651442512), we get a palindrome (715895598517).

The spelling of 215244156005 in words is "two hundred fifteen billion, two hundred forty-four million, one hundred fifty-six thousand, five".