216706294400381 has 4 divisors (see below), whose sum is σ = 216727820812992. Its totient is φ = 216684767987772.

The previous prime is 216706294400371. The next prime is 216706294400503. The reversal of 216706294400381 is 183004492607612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216706294400381 is a prime.

It is a super-2 number, since 2×216706294400381² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216706294400371) 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, 10763191205 + ... + 10763211338.

It is an arithmetic number, because the mean of its divisors is an integer number (54181955203248).

Almost surely, 2^{216706294400381} is an apocalyptic number.

It is an amenable number.

216706294400381 is a deficient number, since it is larger than the sum of its proper divisors (21526412611).

216706294400381 is a wasteful number, since it uses less digits than its factorization.

216706294400381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21526412610.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 216706294400381 in words is "two hundred sixteen trillion, seven hundred six billion, two hundred ninety-four million, four hundred thousand, three hundred eighty-one".