213291662497 has 4 divisors (see below), whose sum is σ = 214650208276. Its totient is φ = 211933116720.

The previous prime is 213291662471. The next prime is 213291662501. The reversal of 213291662497 is 794266192312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 96300984976 + 116990677521 = 310324^2 + 342039^2 .

It is a cyclic number.

It is not a de Polignac number, because 213291662497 - 2¹⁵ = 213291629729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213291662197) 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, 679272654 + ... + 679272967.

It is an arithmetic number, because the mean of its divisors is an integer number (53662552069).

Almost surely, 2^213291662497 is an apocalyptic number.

It is an amenable number.

213291662497 is a deficient number, since it is larger than the sum of its proper divisors (1358545779).

213291662497 is a wasteful number, since it uses less digits than its factorization.

213291662497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358545778.

The product of its digits is 1959552, while the sum is 52.

The spelling of 213291662497 in words is "two hundred thirteen billion, two hundred ninety-one million, six hundred sixty-two thousand, four hundred ninety-seven".