213146644437 has 6 divisors (see below), whose sum is σ = 307878486422. Its totient is φ = 142097762952.

The previous prime is 213146644409. The next prime is 213146644441. The reversal of 213146644437 is 734446641312.

213146644437 is a `hidden beast` number, since 2 + 1 + 3 + 146 + 64 + 443 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 205744795281 + 7401849156 = 453591^2 + 86034^2 .

It is not a de Polignac number, because 213146644437 - 2¹¹ = 213146642389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 213146644392 and 213146644401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213146642437) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11841480238 + ... + 11841480255.

Almost surely, 2^213146644437 is an apocalyptic number.

It is an amenable number.

213146644437 is a deficient number, since it is larger than the sum of its proper divisors (94731841985).

213146644437 is a wasteful number, since it uses less digits than its factorization.

213146644437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23682960499 (or 23682960496 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 45.

The spelling of 213146644437 in words is "two hundred thirteen billion, one hundred forty-six million, six hundred forty-four thousand, four hundred thirty-seven".