215162110661 has 8 divisors (see below), whose sum is σ = 215576256504. Its totient is φ = 214748233920.

The previous prime is 215162110621. The next prime is 215162110663. The reversal of 215162110661 is 166011261512.

It can be written as a sum of positive squares in 4 ways, for example, as 107637142561 + 107524968100 = 328081^2 + 327910^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 215162110661 - 2¹⁰ = 215162109637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215162110663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1571591 + ... + 1703003.

It is an arithmetic number, because the mean of its divisors is an integer number (26947032063).

Almost surely, 2^215162110661 is an apocalyptic number.

It is an amenable number.

215162110661 is a deficient number, since it is larger than the sum of its proper divisors (414145843).

215162110661 is a wasteful number, since it uses less digits than its factorization.

215162110661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134551.

The product of its (nonzero) digits is 4320, while the sum is 32.

The spelling of 215162110661 in words is "two hundred fifteen billion, one hundred sixty-two million, one hundred ten thousand, six hundred sixty-one".