216431635401 has 12 divisors (see below), whose sum is σ = 313335605440. Its totient is φ = 143959080600.

The previous prime is 216431635397. The next prime is 216431635423. The reversal of 216431635401 is 104536134612.

216431635401 is a `hidden beast` number, since 2 + 1 + 643 + 1 + 6 + 3 + 5 + 4 + 0 + 1 = 666.

It is not a de Polignac number, because 216431635401 - 2² = 216431635397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216431635201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27385525 + ... + 27393426.

Almost surely, 2^216431635401 is an apocalyptic number.

It is an amenable number.

216431635401 is a deficient number, since it is larger than the sum of its proper divisors (96903970039).

216431635401 is a wasteful number, since it uses less digits than its factorization.

216431635401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54779396 (or 54779393 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 216431635401 in words is "two hundred sixteen billion, four hundred thirty-one million, six hundred thirty-five thousand, four hundred one".