216970978106 has 8 divisors (see below), whose sum is σ = 328678808724. Its totient is φ = 107411375200.

The previous prime is 216970978061. The next prime is 216970978109. The reversal of 216970978106 is 601879079612.

It can be written as a sum of positive squares in 2 ways, for example, as 209818047481 + 7152930625 = 458059^2 + 84575^2 .

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

It is not an unprimeable number, because it can be changed into a prime (216970978109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537056675 + ... + 537057078.

Almost surely, 2^216970978106 is an apocalyptic number.

216970978106 is a deficient number, since it is larger than the sum of its proper divisors (111707830618).

216970978106 is a wasteful number, since it uses less digits than its factorization.

216970978106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074113856.

The product of its (nonzero) digits is 2286144, while the sum is 56.

The spelling of 216970978106 in words is "two hundred sixteen billion, nine hundred seventy million, nine hundred seventy-eight thousand, one hundred six".