213647991366 has 16 divisors (see below), whose sum is σ = 432704793600. Its totient is φ = 70314528648.

The previous prime is 213647991289. The next prime is 213647991371. The reversal of 213647991366 is 663199746312.

213647991366 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×213647991366³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225366606 + ... + 225367553.

It is an arithmetic number, because the mean of its divisors is an integer number (27044049600).

Almost surely, 2^213647991366 is an apocalyptic number.

213647991366 is an abundant number, since it is smaller than the sum of its proper divisors (219056802234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213647991366 is a wasteful number, since it uses less digits than its factorization.

213647991366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450734243.

The product of its digits is 8817984, while the sum is 57.

The spelling of 213647991366 in words is "two hundred thirteen billion, six hundred forty-seven million, nine hundred ninety-one thousand, three hundred sixty-six".