215561340602 has 8 divisors (see below), whose sum is σ = 326308451700. Its totient is φ = 106791856704.

The previous prime is 215561340581. The next prime is 215561340611. The reversal of 215561340602 is 206043165512.

It can be written as a sum of positive squares in 2 ways, for example, as 170404665601 + 45156675001 = 412801^2 + 212501^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494406527 + ... + 494406962.

Almost surely, 2^215561340602 is an apocalyptic number.

215561340602 is a deficient number, since it is larger than the sum of its proper divisors (110747111098).

215561340602 is a wasteful number, since it uses less digits than its factorization.

215561340602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988813600.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 215561340602 in words is "two hundred fifteen billion, five hundred sixty-one million, three hundred forty thousand, six hundred two".