662621213 has 4 divisors (see below), whose sum is σ = 678782748. Its totient is φ = 646459680.

The previous prime is 662621177. The next prime is 662621221. The reversal of 662621213 is 312126266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312126266 = 2 ⋅156063133.

It can be written as a sum of positive squares in 2 ways, for example, as 162741049 + 499880164 = 12757^2 + 22358^2 .

It is a cyclic number.

It is not a de Polignac number, because 662621213 - 2⁸ = 662620957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662621233) 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, 8080706 + ... + 8080787.

It is an arithmetic number, because the mean of its divisors is an integer number (169695687).

Almost surely, 2^662621213 is an apocalyptic number.

It is an amenable number.

662621213 is a deficient number, since it is larger than the sum of its proper divisors (16161535).

662621213 is a wasteful number, since it uses less digits than its factorization.

662621213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16161534.

The product of its digits is 5184, while the sum is 29.

The square root of 662621213 is about 25741.4298942386. The cubic root of 662621213 is about 871.8098638030.

Adding to 662621213 its reverse (312126266), we get a palindrome (974747479).

The spelling of 662621213 in words is "six hundred sixty-two million, six hundred twenty-one thousand, two hundred thirteen".