213246661055 has 4 divisors (see below), whose sum is σ = 255895993272. Its totient is φ = 170597328840.

The previous prime is 213246661049. The next prime is 213246661109. The reversal of 213246661055 is 550166642312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 213246661055 - 2²² = 213242466751 is a prime.

It is a super-2 number, since 2×213246661055² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21324666101 + ... + 21324666110.

It is an arithmetic number, because the mean of its divisors is an integer number (63973998318).

Almost surely, 2^213246661055 is an apocalyptic number.

213246661055 is a deficient number, since it is larger than the sum of its proper divisors (42649332217).

213246661055 is an equidigital number, since it uses as much as digits as its factorization.

213246661055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42649332216.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 213246661055 in words is "two hundred thirteen billion, two hundred forty-six million, six hundred sixty-one thousand, fifty-five".